second commit

.gitignore

@@ -0,0 +1,45 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.build/
+.buildlog/
+.history
+.svn/
+.swiftpm/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins-dependencies
+.pub-cache/
+.pub/
+/build/
+/coverage/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release

.metadata

@@ -0,0 +1,45 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "559ffa3f75e7402d65a8def9c28389a9b2e6fe42"
+  channel: "stable"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+      base_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+    - platform: android
+      create_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+      base_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+    - platform: ios
+      create_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+      base_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+    - platform: linux
+      create_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+      base_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+    - platform: macos
+      create_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+      base_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+    - platform: web
+      create_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+      base_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+    - platform: windows
+      create_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+      base_revision: 559ffa3f75e7402d65a8def9c28389a9b2e6fe42
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

analysis_options.yaml

@@ -0,0 +1,24 @@
+include: package:flutter_lints/flutter.yaml
+
+analyzer:
+  exclude:
+    - "**/*.g.dart"
+    - "**/*.freezed.dart"
+  language:
+    strict-casts: true
+    strict-raw-types: true
+  errors:
+    invalid_annotation_target: ignore
+
+linter:
+  rules:
+    - always_declare_return_types
+    - avoid_print
+    - prefer_const_constructors
+    - prefer_const_declarations
+    - prefer_final_locals
+    - prefer_single_quotes
+    - require_trailing_commas
+    - sort_child_properties_last
+    - unawaited_futures
+    - use_super_parameters

android/.gitignore

@@ -0,0 +1,14 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+.cxx/
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/to/reference-keystore
+key.properties
+**/*.keystore
+**/*.jks

android/app/build.gradle.kts

@@ -0,0 +1,45 @@
+plugins {
+    id("com.android.application")
+    // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
+    id("dev.flutter.flutter-gradle-plugin")
+}
+
+android {
+    namespace = "com.example.nearle_pos"
+    compileSdk = flutter.compileSdkVersion
+    ndkVersion = flutter.ndkVersion
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId = "com.example.nearle_pos"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://flutter.dev/to/review-gradle-config.
+        minSdk = flutter.minSdkVersion
+        targetSdk = flutter.targetSdkVersion
+        versionCode = flutter.versionCode
+        versionName = flutter.versionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig = signingConfigs.getByName("debug")
+        }
+    }
+}
+
+kotlin {
+    compilerOptions {
+        jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17
+    }
+}
+
+flutter {
+    source = "../.."
+}

android/app/src/debug/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,45 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application
+        android:label="nearle_pos"
+        android:name="${applicationName}"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:launchMode="singleTop"
+            android:taskAffinity=""
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+    <!-- Required to query activities that can process text, see:
+         https://developer.android.com/training/package-visibility and
+         https://developer.android.com/reference/android/content/Intent#ACTION_PROCESS_TEXT.
+
+         In particular, this is used by the Flutter engine in io.flutter.plugin.text.ProcessTextPlugin. -->
+    <queries>
+        <intent>
+            <action android:name="android.intent.action.PROCESS_TEXT"/>
+            <data android:mimeType="text/plain"/>
+        </intent>
+    </queries>
+</manifest>

android/app/src/main/kotlin/com/example/nearle_pos/MainActivity.kt

@@ -0,0 +1,5 @@
+package com.example.nearle_pos
+
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity : FlutterActivity()

android/app/src/main/res/drawable-v21/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

android/app/src/main/res/drawable/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

android/app/src/main/res/values-night/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

android/app/src/main/res/values/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

android/app/src/profile/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

android/build.gradle.kts

@@ -0,0 +1,24 @@
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+val newBuildDir: Directory =
+    rootProject.layout.buildDirectory
+        .dir("../../build")
+        .get()
+rootProject.layout.buildDirectory.value(newBuildDir)
+
+subprojects {
+    val newSubprojectBuildDir: Directory = newBuildDir.dir(project.name)
+    project.layout.buildDirectory.value(newSubprojectBuildDir)
+}
+subprojects {
+    project.evaluationDependsOn(":app")
+}
+
+tasks.register<Delete>("clean") {
+    delete(rootProject.layout.buildDirectory)
+}

android/gradle.properties

@@ -0,0 +1,6 @@
+org.gradle.jvmargs=-Xmx8G -XX:MaxMetaspaceSize=4G -XX:ReservedCodeCacheSize=512m -XX:+HeapDumpOnOutOfMemoryError
+android.useAndroidX=true
+# This newDsl flag was added by the Flutter template
+android.newDsl=false
+# This builtInKotlin flag was added by the Flutter template
+android.builtInKotlin=false

android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.1.0-all.zip

android/settings.gradle.kts

@@ -0,0 +1,26 @@
+pluginManagement {
+    val flutterSdkPath =
+        run {
+            val properties = java.util.Properties()
+            file("local.properties").inputStream().use { properties.load(it) }
+            val flutterSdkPath = properties.getProperty("flutter.sdk")
+            require(flutterSdkPath != null) { "flutter.sdk not set in local.properties" }
+            flutterSdkPath
+        }
+
+    includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")
+
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+plugins {
+    id("dev.flutter.flutter-plugin-loader") version "1.0.0"
+    id("com.android.application") version "9.0.1" apply false
+    id("org.jetbrains.kotlin.android") version "2.3.20" apply false
+}
+
+include(":app")

ios/.gitignore

@@ -0,0 +1,34 @@
+**/dgph
+*.mode1v3
+*.mode2v3
+*.moved-aside
+*.pbxuser
+*.perspectivev3
+**/*sync/
+.sconsign.dblite
+.tags*
+**/.vagrant/
+**/DerivedData/
+Icon?
+**/Pods/
+**/.symlinks/
+profile
+xcuserdata
+**/.generated/
+Flutter/App.framework
+Flutter/Flutter.framework
+Flutter/Flutter.podspec
+Flutter/Generated.xcconfig
+Flutter/ephemeral/
+Flutter/app.flx
+Flutter/app.zip
+Flutter/flutter_assets/
+Flutter/flutter_export_environment.sh
+ServiceDefinitions.json
+Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!default.mode1v3
+!default.mode2v3
+!default.pbxuser
+!default.perspectivev3

ios/Flutter/AppFrameworkInfo.plist

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+</dict>
+</plist>

ios/Flutter/Debug.xcconfig

@@ -0,0 +1 @@
+#include "Generated.xcconfig"

ios/Flutter/Release.xcconfig

@@ -0,0 +1 @@
+#include "Generated.xcconfig"

ios/Runner.xcodeproj/project.pbxproj

@@ -0,0 +1,644 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 54;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */; };
+		331C808B294A63AB00263BE5 /* RunnerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 331C807B294A618700263BE5 /* RunnerTests.swift */; };
+		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
+		74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 74858FAE1ED2DC5600515810 /* AppDelegate.swift */; };
+		7884E8682EC3CC0700C636F2 /* SceneDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7884E8672EC3CC0400C636F2 /* SceneDelegate.swift */; };
+		78A318202AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage in Frameworks */ = {isa = PBXBuildFile; productRef = 78A3181F2AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage */; };
+		97C146FC1CF9000F007C117D /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FA1CF9000F007C117D /* Main.storyboard */; };
+		97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FD1CF9000F007C117D /* Assets.xcassets */; };
+		97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */; };
+/* End PBXBuildFile section */
+
+/* Begin PBXContainerItemProxy section */
+		331C8085294A63A400263BE5 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 97C146E61CF9000F007C117D /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 97C146ED1CF9000F007C117D;
+			remoteInfo = Runner;
+		};
+/* End PBXContainerItemProxy section */
+
+/* Begin PBXCopyFilesBuildPhase section */
+		9705A1C41CF9048500538489 /* Embed Frameworks */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = "";
+			dstSubfolderSpec = 10;
+			files = (
+			);
+			name = "Embed Frameworks";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXCopyFilesBuildPhase section */
+
+/* Begin PBXFileReference section */
+		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
+		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
+		331C807B294A618700263BE5 /* RunnerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RunnerTests.swift; sourceTree = "<group>"; };
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+		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
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+		74858FAE1ED2DC5600515810 /* AppDelegate.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
+		7884E8672EC3CC0400C636F2 /* SceneDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SceneDelegate.swift; sourceTree = "<group>"; };
+		78E0A7A72DC9AD7400C4905E /* FlutterGeneratedPluginSwiftPackage */ = {isa = PBXFileReference; lastKnownFileType = wrapper; name = FlutterGeneratedPluginSwiftPackage; path = Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage; sourceTree = "<group>"; };
+		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = Release.xcconfig; path = Flutter/Release.xcconfig; sourceTree = "<group>"; };
+		9740EEB21CF90195004384FC /* Debug.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Debug.xcconfig; path = Flutter/Debug.xcconfig; sourceTree = "<group>"; };
+		9740EEB31CF90195004384FC /* Generated.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Generated.xcconfig; path = Flutter/Generated.xcconfig; sourceTree = "<group>"; };
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+		97C146FB1CF9000F007C117D /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
+		97C146FD1CF9000F007C117D /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
+		97C147001CF9000F007C117D /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
+		97C147021CF9000F007C117D /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+/* End PBXFileReference section */
+
+/* Begin PBXFrameworksBuildPhase section */
+		97C146EB1CF9000F007C117D /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				78A318202AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage in Frameworks */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXFrameworksBuildPhase section */
+
+/* Begin PBXGroup section */
+		331C8082294A63A400263BE5 /* RunnerTests */ = {
+			isa = PBXGroup;
+			children = (
+				331C807B294A618700263BE5 /* RunnerTests.swift */,
+			);
+			path = RunnerTests;
+			sourceTree = "<group>";
+		};
+		9740EEB11CF90186004384FC /* Flutter */ = {
+			isa = PBXGroup;
+			children = (
+				78E0A7A72DC9AD7400C4905E /* FlutterGeneratedPluginSwiftPackage */,
+				3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */,
+				9740EEB21CF90195004384FC /* Debug.xcconfig */,
+				7AFA3C8E1D35360C0083082E /* Release.xcconfig */,
+				9740EEB31CF90195004384FC /* Generated.xcconfig */,
+			);
+			name = Flutter;
+			sourceTree = "<group>";
+		};
+		97C146E51CF9000F007C117D = {
+			isa = PBXGroup;
+			children = (
+				9740EEB11CF90186004384FC /* Flutter */,
+				97C146F01CF9000F007C117D /* Runner */,
+				97C146EF1CF9000F007C117D /* Products */,
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+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147061CF9000F007C117D /* Debug */,
+				97C147071CF9000F007C117D /* Release */,
+				249021D4217E4FDB00AE95B9 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+
+/* Begin XCLocalSwiftPackageReference section */
+		781AD8BC2B33823900A9FFBB /* XCLocalSwiftPackageReference "Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage" */ = {
+			isa = XCLocalSwiftPackageReference;
+			relativePath = Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage;
+		};
+/* End XCLocalSwiftPackageReference section */
+
+/* Begin XCSwiftPackageProductDependency section */
+		78A3181F2AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage */ = {
+			isa = XCSwiftPackageProductDependency;
+			productName = FlutterGeneratedPluginSwiftPackage;
+		};
+/* End XCSwiftPackageProductDependency section */
+	};
+	rootObject = 97C146E61CF9000F007C117D /* Project object */;
+}

ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -0,0 +1,119 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1510"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <PreActions>
+         <ExecutionAction
+            ActionType = "Xcode.IDEStandardExecutionActionsCore.ExecutionActionType.ShellScriptAction">
+            <ActionContent
+               title = "Run Prepare Flutter Framework Script"
+               scriptText = "/bin/sh &quot;$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh&quot; prepare&#10;">
+               <EnvironmentBuildable>
+                  <BuildableReference
+                     BuildableIdentifier = "primary"
+                     BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+                     BuildableName = "Runner.app"
+                     BlueprintName = "Runner"
+                     ReferencedContainer = "container:Runner.xcodeproj">
+                  </BuildableReference>
+               </EnvironmentBuildable>
+            </ActionContent>
+         </ExecutionAction>
+      </PreActions>
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+               BuildableName = "Runner.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      customLLDBInitFile = "$(SRCROOT)/Flutter/ephemeral/flutter_lldbinit"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <Testables>
+         <TestableReference
+            skipped = "NO"
+            parallelizable = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "331C8080294A63A400263BE5"
+               BuildableName = "RunnerTests.xctest"
+               BlueprintName = "RunnerTests"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      customLLDBInitFile = "$(SRCROOT)/Flutter/ephemeral/flutter_lldbinit"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      enableGPUValidationMode = "1"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Profile"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

ios/Runner.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+</Workspace>

ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

ios/Runner/AppDelegate.swift

@@ -0,0 +1,16 @@
+import Flutter
+import UIKit
+
+@main
+@objc class AppDelegate: FlutterAppDelegate, FlutterImplicitEngineDelegate {
+  override func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+  ) -> Bool {
+    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+  }
+
+  func didInitializeImplicitFlutterEngine(_ engineBridge: FlutterImplicitEngineBridge) {
+    GeneratedPluginRegistrant.register(with: engineBridge.pluginRegistry)
+  }
+}

ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,122 @@
+{
+  "images" : [
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "83.5x83.5",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-83.5x83.5@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Icon-App-1024x1024@1x.png",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md

@@ -0,0 +1,5 @@
+# Launch Screen Assets
+
+You can customize the launch screen with your own desired assets by replacing the image files in this directory.
+
+You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images.

ios/Runner/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G29" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Ydg-fD-yQy"/>
+                        <viewControllerLayoutGuide type="bottom" id="xbc-2k-c8Z"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="1a2-6s-vTC"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="4X2-HB-R7a"/>
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="LaunchImage" width="168" height="185"/>
+    </resources>
+</document>

ios/Runner/Base.lproj/Main.storyboard

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--Flutter View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="FlutterViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

ios/Runner/Info.plist

@@ -0,0 +1,70 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CADisableMinimumFrameDurationOnPhone</key>
+	<true/>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDisplayName</key>
+	<string>Nearle Pos</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>nearle_pos</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(FLUTTER_BUILD_NAME)</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<false/>
+		<key>UISceneConfigurations</key>
+		<dict>
+			<key>UIWindowSceneSessionRoleApplication</key>
+			<array>
+				<dict>
+					<key>UISceneClassName</key>
+					<string>UIWindowScene</string>
+					<key>UISceneConfigurationName</key>
+					<string>flutter</string>
+					<key>UISceneDelegateClassName</key>
+					<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
+					<key>UISceneStoryboardFile</key>
+					<string>Main</string>
+				</dict>
+			</array>
+		</dict>
+	</dict>
+	<key>UIApplicationSupportsIndirectInputEvents</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

ios/Runner/Runner-Bridging-Header.h

@@ -0,0 +1 @@
+#import "GeneratedPluginRegistrant.h"

ios/Runner/SceneDelegate.swift

@@ -0,0 +1,6 @@
+import Flutter
+import UIKit
+
+class SceneDelegate: FlutterSceneDelegate {
+
+}

ios/RunnerTests/RunnerTests.swift

@@ -0,0 +1,12 @@
+import Flutter
+import UIKit
+import XCTest
+
+class RunnerTests: XCTestCase {
+
+  func testExample() {
+    // If you add code to the Runner application, consider adding tests here.
+    // See https://developer.apple.com/documentation/xctest for more information about using XCTest.
+  }
+
+}

lib/app/app.dart

@@ -0,0 +1,27 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../core/constants/app_constants.dart';
+import '../core/router/app_router.dart';
+import '../core/theme/app_theme.dart';
+
+class NearlePosApp extends ConsumerWidget {
+  const NearlePosApp({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    return MaterialApp.router(
+      title: AppConstants.appName,
+      debugShowCheckedModeBanner: false,
+      theme: AppTheme.light,
+      routerConfig: ref.watch(routerProvider),
+      builder: (context, child) {
+        // A POS runs on fixed hardware; ignore OS font scaling so the dense
+        // billing panel can never overflow.
+        return MediaQuery.withNoTextScaling(
+          child: child ?? const SizedBox.shrink(),
+        );
+      },
+    );
+  }
+}

lib/app/providers.dart

@@ -0,0 +1,91 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../core/services/receipt_service.dart';
+import '../core/services/sound_service.dart';
+import '../data/datasources/local_store.dart';
+import '../data/repositories/customer_repository_impl.dart';
+import '../data/repositories/product_repository_impl.dart';
+import '../data/datasources/remote_catalogue_source.dart';
+import '../data/repositories/sync_repository_impl.dart';
+import '../data/repositories/transaction_repository_impl.dart';
+import '../domain/repositories/customer_repository.dart';
+import '../domain/repositories/product_repository.dart';
+import '../domain/repositories/sync_repository.dart';
+import '../domain/repositories/transaction_repository.dart';
+import '../domain/usecases/checkout_sale.dart';
+
+/// Root data source. Overridden in tests with an in-memory double.
+final localStoreProvider = Provider<LocalStore>((ref) => LocalStore.instance);
+
+// ---------------------------------------------------------- Repositories
+final productRepositoryProvider = Provider<ProductRepository>(
+  (ref) => ProductRepositoryImpl(ref.watch(localStoreProvider)),
+);
+
+final customerRepositoryProvider = Provider<CustomerRepository>(
+  (ref) => CustomerRepositoryImpl(ref.watch(localStoreProvider)),
+);
+
+final transactionRepositoryProvider = Provider<TransactionRepository>(
+  (ref) => TransactionRepositoryImpl(ref.watch(localStoreProvider)),
+);
+
+/// Simulated back-office endpoints. Held as singletons so the offline toggle
+/// in Settings affects every call.
+final remoteCatalogueProvider =
+    Provider<RemoteCatalogueSource>((ref) => RemoteCatalogueSource());
+
+final remoteReportSinkProvider =
+    Provider<RemoteReportSink>((ref) => RemoteReportSink());
+
+final syncRepositoryProvider = Provider<SyncRepository>(
+  (ref) => SyncRepositoryImpl(
+    ref.watch(localStoreProvider),
+    ref.watch(remoteCatalogueProvider),
+    ref.watch(remoteReportSinkProvider),
+  ),
+);
+
+// ------------------------------------------------------------- Use cases
+final checkoutSaleProvider = Provider<CheckoutSale>(
+  (ref) => CheckoutSale(
+    productRepository: ref.watch(productRepositoryProvider),
+    customerRepository: ref.watch(customerRepositoryProvider),
+    transactionRepository: ref.watch(transactionRepositoryProvider),
+  ),
+);
+
+// -------------------------------------------------------------- Services
+final soundServiceProvider =
+    Provider<SoundService>((ref) => SoundService.instance);
+
+final receiptServiceProvider =
+    Provider<ReceiptService>((ref) => ReceiptService.instance);
+
+// --------------------------------------------------------------- Session
+class CashierSession {
+  const CashierSession({
+    required this.name,
+    required this.role,
+    required this.terminalId,
+  });
+
+  final String name;
+  final String role;
+  final String terminalId;
+}
+
+final cashierSessionProvider = StateProvider<CashierSession>(
+  (ref) => const CashierSession(
+    name: 'Suriya',
+    role: 'ADMIN',
+    terminalId: 'TERM-01',
+  ),
+);
+
+/// Ticks once a minute to drive the header clock without rebuilding on every
+/// frame.
+final clockProvider = StreamProvider<DateTime>((ref) async* {
+  yield DateTime.now();
+  yield* Stream.periodic(const Duration(seconds: 20), (_) => DateTime.now());
+});

lib/core/constants/app_constants.dart

@@ -0,0 +1,49 @@
+/// Application-wide configuration constants.
+class AppConstants {
+  const AppConstants._();
+
+  static const String appName = 'Nearle POS';
+  static const String storeName = 'Nearle Daily';
+  static const String storeAddress = '12 Gandhipuram Main Rd, Coimbatore 641012';
+  static const String storeGstin = '33ABCDE1234F1Z5';
+  static const String storePhone = '+91 90000 12345';
+  static const String currencySymbol = '\u20B9';
+  static const String locale = 'en_IN';
+
+  /// Standard GST slab applied when a product does not declare its own.
+  static const double defaultGstRate = 0.18;
+
+  /// One loyalty point is earned per this many rupees of net sale value.
+  static const double loyaltyRupeesPerPoint = 10;
+
+  /// Rupee value of a single loyalty point when redeemed.
+  static const double loyaltyPointValue = 0.25;
+
+  static const int mobileNumberLength = 10;
+
+  /// Barcode scanners emit keystrokes fast; anything slower is human typing.
+  static const Duration barcodeScanTimeout = Duration(milliseconds: 120);
+  static const int minBarcodeLength = 6;
+
+  /// Idle time after a completed sale before the terminal resets itself.
+  static const Duration postSaleResetDelay = Duration(seconds: 3);
+
+  static const int lowStockThreshold = 10;
+  static const int maxParkedBills = 20;
+  static const int maxCartQuantityPerLine = 999;
+}
+
+/// Hive box names.
+class StorageKeys {
+  const StorageKeys._();
+
+  static const String products = 'box_products';
+  static const String customers = 'box_customers';
+  static const String transactions = 'box_transactions';
+  static const String parkedBills = 'box_parked_bills';
+  static const String settings = 'box_settings';
+
+  static const String cashierName = 'cashier_name';
+  static const String cashierRole = 'cashier_role';
+  static const String terminalId = 'terminal_id';
+}

lib/core/constants/asset_paths.dart

@@ -0,0 +1,13 @@
+/// Typed references to bundled assets.
+///
+/// Only sounds are bundled: product imagery uses emoji glyphs and the welcome
+/// artwork is painted in code, so there are no raster or SVG assets to ship.
+class AssetPaths {
+  const AssetPaths._();
+
+  static const String _snd = 'assets/sounds';
+
+  static const String beepSuccess = '$_snd/beep_success.wav';
+  static const String beepError = '$_snd/beep_error.wav';
+  static const String chargeComplete = '$_snd/charge_complete.wav';
+}

lib/core/router/app_router.dart

@@ -0,0 +1,140 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+
+import '../../domain/entities/transaction.dart';
+import '../../presentation/auth/providers/auth_controller.dart';
+import '../../presentation/auth/screens/login_screen.dart';
+import '../../presentation/customer/screens/customer_registration_screen.dart';
+import '../../presentation/customer/screens/existing_customer_screen.dart';
+import '../../presentation/payment/screens/payment_screen.dart';
+import '../../presentation/pos/screens/pos_dashboard_screen.dart';
+import '../../presentation/receipt/screens/receipt_screen.dart';
+import '../../presentation/welcome/screens/welcome_screen.dart';
+
+class AppRoutes {
+  const AppRoutes._();
+
+  static const String login = '/login';
+  static const String welcome = '/';
+  static const String registerCustomer = '/customer/new';
+  static const String existingCustomer = '/customer/find';
+  static const String pos = '/pos';
+  static const String payment = '/pos/payment';
+  static const String receipt = '/pos/receipt';
+}
+
+/// Router with an authentication guard.
+///
+/// Every route except [AppRoutes.login] requires a signed-in store, and an
+/// already-signed-in terminal is bounced away from the login screen.
+final routerProvider = Provider<GoRouter>((ref) {
+  // GoRouter re-evaluates `redirect` whenever this notifier fires.
+  final authChanged = ValueNotifier<bool>(
+    ref.read(authControllerProvider).isAuthenticated,
+  );
+  ref.listen<AuthState>(
+    authControllerProvider,
+    (_, next) => authChanged.value = next.isAuthenticated,
+  );
+  ref.onDispose(authChanged.dispose);
+
+  return GoRouter(
+    initialLocation: AppRoutes.login,
+    refreshListenable: authChanged,
+    debugLogDiagnostics: false,
+    redirect: (context, state) {
+      final signedIn = ref.read(authControllerProvider).isAuthenticated;
+      final atLogin = state.matchedLocation == AppRoutes.login;
+
+      if (!signedIn) return atLogin ? null : AppRoutes.login;
+      if (atLogin) return AppRoutes.welcome;
+      return null;
+    },
+    routes: [
+      GoRoute(
+        path: AppRoutes.login,
+        name: 'login',
+        pageBuilder: (context, state) => _fade(state, const LoginScreen()),
+      ),
+      GoRoute(
+        path: AppRoutes.welcome,
+        name: 'welcome',
+        pageBuilder: (context, state) => _fade(state, const WelcomeScreen()),
+      ),
+      GoRoute(
+        path: AppRoutes.registerCustomer,
+        name: 'registerCustomer',
+        pageBuilder: (context, state) => _slide(
+          state,
+          CustomerRegistrationScreen(
+            prefillMobile: state.uri.queryParameters['mobile'],
+          ),
+        ),
+      ),
+      GoRoute(
+        path: AppRoutes.existingCustomer,
+        name: 'existingCustomer',
+        pageBuilder: (context, state) =>
+            _slide(state, const ExistingCustomerScreen()),
+      ),
+      GoRoute(
+        path: AppRoutes.pos,
+        name: 'pos',
+        pageBuilder: (context, state) =>
+            _fade(state, const PosDashboardScreen()),
+        routes: [
+          GoRoute(
+            path: 'payment',
+            name: 'payment',
+            pageBuilder: (context, state) =>
+                _slide(state, const PaymentScreen()),
+          ),
+          GoRoute(
+            path: 'receipt',
+            name: 'receipt',
+            pageBuilder: (context, state) => _fade(
+              state,
+              ReceiptScreen(transaction: state.extra! as SaleTransaction),
+            ),
+          ),
+        ],
+      ),
+    ],
+    errorBuilder: (context, state) => Scaffold(
+      body: Center(child: Text('Route not found: ${state.uri}')),
+    ),
+  );
+});
+
+CustomTransitionPage<void> _fade(GoRouterState state, Widget child) {
+  return CustomTransitionPage(
+    key: state.pageKey,
+    child: child,
+    transitionDuration: const Duration(milliseconds: 220),
+    transitionsBuilder: (_, animation, __, child) =>
+        FadeTransition(opacity: animation, child: child),
+  );
+}
+
+CustomTransitionPage<void> _slide(GoRouterState state, Widget child) {
+  return CustomTransitionPage(
+    key: state.pageKey,
+    child: child,
+    transitionDuration: const Duration(milliseconds: 260),
+    transitionsBuilder: (_, animation, __, child) {
+      final curved =
+          CurvedAnimation(parent: animation, curve: Curves.easeOutCubic);
+      return FadeTransition(
+        opacity: curved,
+        child: SlideTransition(
+          position: Tween<Offset>(
+            begin: const Offset(0, 0.03),
+            end: Offset.zero,
+          ).animate(curved),
+          child: child,
+        ),
+      );
+    },
+  );
+}

lib/core/services/barcode_service.dart

@@ -0,0 +1,91 @@
+import 'dart:async';
+
+import 'package:flutter/services.dart';
+
+import '../constants/app_constants.dart';
+
+/// Detects hardware barcode scanners that emulate a keyboard.
+///
+/// Such scanners emit an entire code in a few milliseconds and terminate it
+/// with Enter. We buffer raw key events and only treat the buffer as a scan
+/// when the characters arrived faster than a human could type — that way the
+/// cashier can still type into the same field by hand.
+class BarcodeService {
+  BarcodeService({this.onScan, this.onManualKey});
+
+  final void Function(String code)? onScan;
+  final VoidCallback? onManualKey;
+
+  final StringBuffer _buffer = StringBuffer();
+  DateTime? _lastKeyAt;
+  Timer? _flushTimer;
+
+  bool _attached = false;
+
+  void attach() {
+    if (_attached) return;
+    HardwareKeyboard.instance.addHandler(_handleKey);
+    _attached = true;
+  }
+
+  void detach() {
+    if (!_attached) return;
+    HardwareKeyboard.instance.removeHandler(_handleKey);
+    _flushTimer?.cancel();
+    _attached = false;
+  }
+
+  bool _handleKey(KeyEvent event) {
+    if (event is! KeyDownEvent) return false;
+
+    final now = DateTime.now();
+    final gap = _lastKeyAt == null
+        ? Duration.zero
+        : now.difference(_lastKeyAt!);
+    _lastKeyAt = now;
+
+    // A long pause means a new entry started; discard whatever was buffered.
+    if (gap > AppConstants.barcodeScanTimeout) {
+      _buffer.clear();
+    }
+
+    if (event.logicalKey == LogicalKeyboardKey.enter ||
+        event.logicalKey == LogicalKeyboardKey.numpadEnter) {
+      return _flush();
+    }
+
+    final char = event.character;
+    if (char == null || char.trim().isEmpty) return false;
+    if (!RegExp(r'^[0-9A-Za-z\-]$').hasMatch(char)) return false;
+
+    _buffer.write(char);
+    _scheduleFlush();
+    return false;
+  }
+
+  /// Some scanners are not configured to send a terminating Enter, so we also
+  /// flush on a short idle window.
+  void _scheduleFlush() {
+    _flushTimer?.cancel();
+    _flushTimer = Timer(
+      AppConstants.barcodeScanTimeout * 2,
+      () => _flush(),
+    );
+  }
+
+  bool _flush() {
+    _flushTimer?.cancel();
+    final code = _buffer.toString().trim();
+    _buffer.clear();
+
+    if (code.length >= AppConstants.minBarcodeLength) {
+      onScan?.call(code);
+      return true;
+    }
+
+    if (code.isNotEmpty) onManualKey?.call();
+    return false;
+  }
+
+  void dispose() => detach();
+}

lib/core/services/receipt_service.dart

@@ -0,0 +1,335 @@
+import 'dart:typed_data';
+
+import 'package:flutter/foundation.dart';
+import 'package:pdf/pdf.dart';
+import 'package:pdf/widgets.dart' as pw;
+import 'package:printing/printing.dart';
+
+import '../../domain/entities/transaction.dart';
+import '../constants/app_constants.dart';
+import '../utils/formatters.dart';
+
+/// Builds and prints an 80mm thermal GST invoice.
+class ReceiptService {
+  ReceiptService._();
+
+  static final ReceiptService instance = ReceiptService._();
+
+  /// 80mm roll with a small safety margin.
+  static const double _rollWidth = 78 * PdfPageFormat.mm;
+
+  Future<Uint8List> build(SaleTransaction txn) async {
+    final doc = pw.Document(title: txn.invoiceNumber);
+    final font = await PdfGoogleFonts.interRegular();
+    final bold = await PdfGoogleFonts.interSemiBold();
+
+    final cart = txn.cart;
+
+    doc.addPage(
+      pw.Page(
+        pageFormat: PdfPageFormat(
+          _rollWidth,
+          double.infinity,
+          marginAll: 6 * PdfPageFormat.mm,
+        ),
+        theme: pw.ThemeData.withFont(base: font, bold: bold),
+        build: (context) => pw.Column(
+          crossAxisAlignment: pw.CrossAxisAlignment.stretch,
+          children: [
+            _header(txn),
+            _divider(),
+            _meta(txn),
+            _divider(),
+            _itemsTable(txn),
+            _divider(),
+            _totals(txn),
+            _divider(),
+            _taxSummary(txn),
+            _divider(),
+            _payments(txn),
+            if (cart.customer != null) ...[
+              _divider(),
+              _loyalty(txn),
+            ],
+            pw.SizedBox(height: 8),
+            _footer(txn),
+          ],
+        ),
+      ),
+    );
+
+    return doc.save();
+  }
+
+  // ------------------------------------------------------------- Sections
+  pw.Widget _header(SaleTransaction txn) => pw.Column(children: [
+        pw.Text(
+          AppConstants.storeName.toUpperCase(),
+          style: pw.TextStyle(fontSize: 15, fontWeight: pw.FontWeight.bold),
+          textAlign: pw.TextAlign.center,
+        ),
+        pw.SizedBox(height: 2),
+        pw.Text(
+          AppConstants.storeAddress,
+          style: const pw.TextStyle(fontSize: 7),
+          textAlign: pw.TextAlign.center,
+        ),
+        pw.Text(
+          'GSTIN: ${AppConstants.storeGstin}  |  ${AppConstants.storePhone}',
+          style: const pw.TextStyle(fontSize: 7),
+          textAlign: pw.TextAlign.center,
+        ),
+        pw.SizedBox(height: 4),
+        pw.Text(
+          'TAX INVOICE',
+          style: pw.TextStyle(fontSize: 9, fontWeight: pw.FontWeight.bold),
+        ),
+      ]);
+
+  pw.Widget _meta(SaleTransaction txn) {
+    final c = txn.customer;
+    return pw.Column(children: [
+      _row('Invoice', txn.invoiceNumber),
+      _row('Date', Formatters.receiptStamp(txn.createdAt)),
+      _row('Cashier', txn.cashierName),
+      _row('Terminal', txn.terminalId),
+      _row('Customer', c == null ? 'Walk-in' : c.name),
+      if (c != null) _row('Mobile', Formatters.mobile(c.mobile)),
+    ]);
+  }
+
+  pw.Widget _itemsTable(SaleTransaction txn) {
+    return pw.Column(
+      crossAxisAlignment: pw.CrossAxisAlignment.stretch,
+      children: [
+        pw.Row(children: [
+          pw.Expanded(flex: 5, child: _th('Item')),
+          pw.Expanded(flex: 2, child: _th('Qty', align: pw.TextAlign.center)),
+          pw.Expanded(flex: 3, child: _th('Rate', align: pw.TextAlign.right)),
+          pw.Expanded(flex: 3, child: _th('Amt', align: pw.TextAlign.right)),
+        ]),
+        pw.SizedBox(height: 2),
+        ...txn.cart.lines.map((line) => pw.Padding(
+              padding: const pw.EdgeInsets.symmetric(vertical: 1.5),
+              child: pw.Column(children: [
+                pw.Row(children: [
+                  pw.Expanded(flex: 5, child: _td(line.product.name)),
+                  pw.Expanded(
+                    flex: 2,
+                    child: _td(
+                      _qty(line.quantity),
+                      align: pw.TextAlign.center,
+                    ),
+                  ),
+                  pw.Expanded(
+                    flex: 3,
+                    child: _td(
+                      line.product.price.toStringAsFixed(2),
+                      align: pw.TextAlign.right,
+                    ),
+                  ),
+                  pw.Expanded(
+                    flex: 3,
+                    child: _td(
+                      line.payable.toStringAsFixed(2),
+                      align: pw.TextAlign.right,
+                    ),
+                  ),
+                ]),
+                if (line.discount.isActive)
+                  pw.Row(children: [
+                    pw.Expanded(
+                      child: _td(
+                        '   ${line.discount.label}  '
+                        '-${line.discountAmount.toStringAsFixed(2)}',
+                        size: 6.5,
+                      ),
+                    ),
+                  ]),
+              ]),
+            )),
+      ],
+    );
+  }
+
+  pw.Widget _totals(SaleTransaction txn) {
+    final cart = txn.cart;
+    return pw.Column(children: [
+      _row('Items', '${cart.lineCount}  (Qty ${_qty(cart.totalQuantity)})'),
+      _row('Subtotal', cart.subtotal.toStringAsFixed(2)),
+      if (cart.membershipDiscountAmount > 0)
+        _row(
+          '${cart.customer!.tier.label} discount',
+          '-${cart.membershipDiscountAmount.toStringAsFixed(2)}',
+        ),
+      if (cart.manualBillDiscountAmount > 0)
+        _row('Discount', '-${cart.manualBillDiscountAmount.toStringAsFixed(2)}'),
+      if (cart.loyaltyRedemptionValue > 0)
+        _row(
+          'Points redeemed (${cart.pointsRedeemed})',
+          '-${cart.loyaltyRedemptionValue.toStringAsFixed(2)}',
+        ),
+      _row('Taxable value', cart.taxableAmount.toStringAsFixed(2)),
+      _row('CGST', cart.cgst.toStringAsFixed(2)),
+      _row('SGST', cart.sgst.toStringAsFixed(2)),
+      if (cart.roundOff != 0)
+        _row('Round off', cart.roundOff.toStringAsFixed(2)),
+      pw.SizedBox(height: 3),
+      pw.Row(
+        mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
+        children: [
+          pw.Text('TOTAL',
+              style: pw.TextStyle(fontSize: 12, fontWeight: pw.FontWeight.bold)),
+          pw.Text(
+            '${AppConstants.currencySymbol}${txn.total.toStringAsFixed(2)}',
+            style: pw.TextStyle(fontSize: 12, fontWeight: pw.FontWeight.bold),
+          ),
+        ],
+      ),
+      if (cart.totalSavings > 0) ...[
+        pw.SizedBox(height: 2),
+        pw.Text(
+          'You saved ${AppConstants.currencySymbol}'
+          '${cart.totalSavings.toStringAsFixed(2)} on this bill',
+          style: pw.TextStyle(fontSize: 7.5, fontWeight: pw.FontWeight.bold),
+          textAlign: pw.TextAlign.center,
+        ),
+      ],
+    ]);
+  }
+
+  pw.Widget _taxSummary(SaleTransaction txn) {
+    final breakdown = txn.cart.taxBreakdown.entries
+        .where((e) => e.value > 0)
+        .toList()
+      ..sort((a, b) => a.key.compareTo(b.key));
+
+    if (breakdown.isEmpty) {
+      return _td('All items zero-rated', size: 7);
+    }
+
+    return pw.Column(children: [
+      _th('GST Summary'),
+      ...breakdown.map((e) => _row(
+            'GST @ ${(e.key * 100).toStringAsFixed(0)}%',
+            e.value.toStringAsFixed(2),
+            size: 7,
+          )),
+    ]);
+  }
+
+  pw.Widget _payments(SaleTransaction txn) => pw.Column(children: [
+        ...txn.payments.map((p) => _row(
+              p.method.label +
+                  (p.reference != null ? ' (${p.reference})' : ''),
+              p.amount.toStringAsFixed(2),
+            )),
+        if (txn.changeDue > 0)
+          _row('Change returned', txn.changeDue.toStringAsFixed(2)),
+      ]);
+
+  pw.Widget _loyalty(SaleTransaction txn) {
+    final c = txn.customer!;
+    final balance = c.loyaltyPoints - txn.pointsRedeemed + txn.pointsEarned;
+    return pw.Column(children: [
+      _row('Points earned', '+${txn.pointsEarned}'),
+      if (txn.pointsRedeemed > 0)
+        _row('Points redeemed', '-${txn.pointsRedeemed}'),
+      _row('Points balance', '$balance'),
+      _row('Membership', c.tier.label),
+    ]);
+  }
+
+  pw.Widget _footer(SaleTransaction txn) => pw.Column(children: [
+        pw.BarcodeWidget(
+          barcode: pw.Barcode.code128(),
+          data: txn.invoiceNumber,
+          width: 140,
+          height: 34,
+          drawText: false,
+        ),
+        pw.SizedBox(height: 4),
+        pw.Text(txn.invoiceNumber, style: const pw.TextStyle(fontSize: 7)),
+        pw.SizedBox(height: 4),
+        pw.Text('Thank you for shopping with us!',
+            style: pw.TextStyle(fontSize: 8, fontWeight: pw.FontWeight.bold)),
+        pw.Text('Goods once sold are exchangeable within 7 days with this bill.',
+            style: const pw.TextStyle(fontSize: 6),
+            textAlign: pw.TextAlign.center),
+        pw.SizedBox(height: 2),
+        pw.Text('Powered by Nearle POS', style: const pw.TextStyle(fontSize: 6)),
+      ]);
+
+  // -------------------------------------------------------------- Helpers
+  String _qty(double q) =>
+      q % 1 == 0 ? q.toStringAsFixed(0) : q.toStringAsFixed(3);
+
+  pw.Widget _divider() => pw.Padding(
+        padding: const pw.EdgeInsets.symmetric(vertical: 3),
+        child: pw.Divider(height: 0.5, borderStyle: pw.BorderStyle.dashed),
+      );
+
+  pw.Widget _th(String text, {pw.TextAlign align = pw.TextAlign.left}) =>
+      pw.Text(text,
+          textAlign: align,
+          style: pw.TextStyle(fontSize: 7.5, fontWeight: pw.FontWeight.bold));
+
+  pw.Widget _td(String text,
+          {pw.TextAlign align = pw.TextAlign.left, double size = 7.5}) =>
+      pw.Text(text, textAlign: align, style: pw.TextStyle(fontSize: size));
+
+  pw.Widget _row(String label, String value, {double size = 7.5}) => pw.Padding(
+        padding: const pw.EdgeInsets.symmetric(vertical: 0.8),
+        child: pw.Row(
+          mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
+          children: [
+            pw.Text(label, style: pw.TextStyle(fontSize: size)),
+            pw.Text(value, style: pw.TextStyle(fontSize: size)),
+          ],
+        ),
+      );
+
+  // --------------------------------------------------------- Printing / IO
+  /// Silent print to the default roll printer — no OS dialog, so the cashier
+  /// is never blocked between sales.
+  Future<bool> printDirect(SaleTransaction txn) async {
+    try {
+      final bytes = await build(txn);
+      final printers = await Printing.listPrinters();
+      final target = printers.where((p) => p.isDefault).firstOrNull ??
+          (printers.isNotEmpty ? printers.first : null);
+
+      if (target == null) return false;
+
+      return await Printing.directPrintPdf(
+        printer: target,
+        onLayout: (_) async => bytes,
+        name: txn.invoiceNumber,
+      );
+    } catch (e) {
+      debugPrint('Direct print failed: $e');
+      return false;
+    }
+  }
+
+  /// Falls back to the system print preview.
+  Future<void> printWithDialog(SaleTransaction txn) async {
+    final bytes = await build(txn);
+    await Printing.layoutPdf(
+      onLayout: (_) async => bytes,
+      name: txn.invoiceNumber,
+    );
+  }
+
+  Future<void> share(SaleTransaction txn) async {
+    final bytes = await build(txn);
+    await Printing.sharePdf(bytes: bytes, filename: '${txn.invoiceNumber}.pdf');
+  }
+
+  /// Opens the cash drawer via the ESC/POS kick pulse on pin 2.
+  Future<void> openCashDrawer() async {
+    // ESC p m t1 t2 — sent to the receipt printer's serial passthrough.
+    // Wired up here as a no-op placeholder for the concrete driver.
+    debugPrint('Cash drawer kick: ESC p 0 25 250');
+  }
+}

lib/core/services/sound_service.dart

@@ -0,0 +1,62 @@
+import 'dart:async';
+
+import 'package:audioplayers/audioplayers.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+
+import '../constants/asset_paths.dart';
+
+/// Audible feedback for scanner billing.
+///
+/// A cashier scanning at speed watches the customer, not the screen, so the
+/// beep is the primary confirmation that an item registered.
+class SoundService {
+  SoundService._();
+
+  static final SoundService instance = SoundService._();
+
+  final AudioPlayer _player = AudioPlayer(playerId: 'nearle_pos_sfx');
+  bool _enabled = true;
+
+  bool get enabled => _enabled;
+  set enabled(bool value) => _enabled = value;
+
+  Future<void> preload() async {
+    try {
+      await _player.setReleaseMode(ReleaseMode.stop);
+    } catch (e) {
+      debugPrint('SoundService preload failed: $e');
+    }
+  }
+
+  Future<void> scanSuccess() => _play(AssetPaths.beepSuccess, haptic: true);
+
+  Future<void> scanError() => _play(AssetPaths.beepError, heavy: true);
+
+  Future<void> saleComplete() => _play(AssetPaths.chargeComplete);
+
+  Future<void> _play(
+    String asset, {
+    bool haptic = false,
+    bool heavy = false,
+  }) async {
+    if (!_enabled) return;
+
+    // Haptics matter on tablets where the speaker may be muted on the floor.
+    if (heavy) {
+      unawaited(HapticFeedback.heavyImpact());
+    } else if (haptic) {
+      unawaited(HapticFeedback.selectionClick());
+    }
+
+    try {
+      await _player.stop();
+      await _player.play(AssetSource(asset.replaceFirst('assets/', '')));
+    } catch (e) {
+      // Never let a missing sound file break the billing flow.
+      debugPrint('SoundService play failed for $asset: $e');
+    }
+  }
+
+  Future<void> dispose() => _player.dispose();
+}

lib/core/theme/app_colors.dart

@@ -0,0 +1,84 @@
+import 'package:flutter/material.dart';
+
+/// Central colour palette for Nearle POS.
+///
+/// Everything is derived from the brand primary `#662582` so that a single
+/// change here re-skins the entire application.
+class AppColors {
+  const AppColors._();
+
+  // ---------------------------------------------------------------- Brand
+  static const Color primary = Color(0xFF662582);
+  static const Color primaryDark = Color(0xFF4B1A60);
+  static const Color primaryLight = Color(0xFF8B4BA6);
+  static const Color primarySurface = Color(0xFFF4EDF7);
+  static const Color primaryBorder = Color(0xFFE3D3EC);
+
+  static const MaterialColor primarySwatch = MaterialColor(0xFF662582, {
+    50: Color(0xFFF4EDF7),
+    100: Color(0xFFE3D3EC),
+    200: Color(0xFFCDB1DC),
+    300: Color(0xFFB68FCC),
+    400: Color(0xFFA475C0),
+    500: Color(0xFF662582),
+    600: Color(0xFF5C2175),
+    700: Color(0xFF4B1A60),
+    800: Color(0xFF3B144B),
+    900: Color(0xFF2A0E36),
+  });
+
+  // -------------------------------------------------------------- Neutrals
+  static const Color background = Color(0xFFF7F7F9);
+  static const Color surface = Color(0xFFFFFFFF);
+  static const Color surfaceAlt = Color(0xFFFAFAFC);
+  static const Color border = Color(0xFFE8E8EE);
+  static const Color divider = Color(0xFFEFEFF4);
+
+  static const Color textPrimary = Color(0xFF17131C);
+  static const Color textSecondary = Color(0xFF6B6577);
+  static const Color textTertiary = Color(0xFF9A94A6);
+  static const Color textOnPrimary = Color(0xFFFFFFFF);
+
+  // ------------------------------------------------------------- Semantic
+  static const Color success = Color(0xFF16A34A);
+  static const Color successSurface = Color(0xFFEAF7EF);
+  static const Color warning = Color(0xFFF59E0B);
+  static const Color warningSurface = Color(0xFFFEF6E7);
+  static const Color danger = Color(0xFFDC2626);
+  static const Color dangerSurface = Color(0xFFFDECEC);
+  static const Color info = Color(0xFF2563EB);
+  static const Color infoSurface = Color(0xFFEAF0FE);
+
+  // ------------------------------------------------------- Membership tiers
+  static const Color tierBronze = Color(0xFFB08D57);
+  static const Color tierSilver = Color(0xFF8E96A3);
+  static const Color tierGold = Color(0xFFD4A017);
+  static const Color tierPlatinum = Color(0xFF4C5A6B);
+
+  // ---------------------------------------------------------------- Effects
+  static const Color glassTint = Color(0x14662582);
+
+  static const List<BoxShadow> shadowSm = [
+    BoxShadow(color: Color(0x0D17131C), blurRadius: 6, offset: Offset(0, 2)),
+  ];
+
+  static const List<BoxShadow> shadowMd = [
+    BoxShadow(color: Color(0x1417131C), blurRadius: 16, offset: Offset(0, 6)),
+  ];
+
+  static const List<BoxShadow> shadowLg = [
+    BoxShadow(color: Color(0x1F17131C), blurRadius: 32, offset: Offset(0, 12)),
+  ];
+
+  static const LinearGradient primaryGradient = LinearGradient(
+    begin: Alignment.topLeft,
+    end: Alignment.bottomRight,
+    colors: [Color(0xFF7A2E9A), Color(0xFF4B1A60)],
+  );
+
+  static const LinearGradient glassGradient = LinearGradient(
+    begin: Alignment.topLeft,
+    end: Alignment.bottomRight,
+    colors: [Color(0x40FFFFFF), Color(0x0DFFFFFF)],
+  );
+}

lib/core/theme/app_dimens.dart

@@ -0,0 +1,83 @@
+import 'package:flutter/widgets.dart';
+
+/// Spacing scale — 4pt grid.
+class AppSpacing {
+  const AppSpacing._();
+
+  static const double xxs = 2;
+  static const double xs = 4;
+  static const double sm = 8;
+  static const double md = 12;
+  static const double lg = 16;
+  static const double xl = 20;
+  static const double xxl = 24;
+  static const double xxxl = 32;
+  static const double huge = 40;
+  static const double giant = 56;
+
+  static const EdgeInsets pageDesktop = EdgeInsets.all(xxl);
+  static const EdgeInsets pageTablet = EdgeInsets.all(lg);
+  static const EdgeInsets card = EdgeInsets.all(lg);
+}
+
+/// Corner radii — brand standard is 16.
+class AppRadius {
+  const AppRadius._();
+
+  static const double xs = 6;
+  static const double sm = 10;
+  static const double md = 12;
+  static const double lg = 16;
+  static const double xl = 20;
+  static const double xxl = 28;
+  static const double pill = 999;
+
+  static const BorderRadius brXs = BorderRadius.all(Radius.circular(xs));
+  static const BorderRadius brSm = BorderRadius.all(Radius.circular(sm));
+  static const BorderRadius brMd = BorderRadius.all(Radius.circular(md));
+  static const BorderRadius brLg = BorderRadius.all(Radius.circular(lg));
+  static const BorderRadius brXl = BorderRadius.all(Radius.circular(xl));
+  static const BorderRadius brPill = BorderRadius.all(Radius.circular(pill));
+}
+
+/// Minimum sizes tuned for finger targets on tablets.
+class AppSizes {
+  const AppSizes._();
+
+  static const double touchTarget = 48;
+  static const double buttonHeight = 52;
+  static const double buttonHeightLarge = 64;
+  static const double inputHeight = 56;
+  static const double headerHeight = 76;
+  static const double customerBarHeight = 72;
+  static const double navItemHeight = 46;
+  static const double productCardAspect = 0.86;
+  static const double keypadKeySize = 76;
+}
+
+/// Motion durations & curves.
+class AppMotion {
+  const AppMotion._();
+
+  static const Duration instant = Duration(milliseconds: 90);
+  static const Duration fast = Duration(milliseconds: 160);
+  static const Duration normal = Duration(milliseconds: 240);
+  static const Duration slow = Duration(milliseconds: 400);
+
+  static const Curve emphasized = Curves.easeOutCubic;
+  static const Curve standard = Curves.easeInOut;
+  static const Curve bouncy = Curves.easeOutBack;
+}
+
+/// Responsive breakpoints.
+class AppBreakpoints {
+  const AppBreakpoints._();
+
+  static const double tabletPortrait = 920;
+  static const double tabletLandscape = 1300;
+  static const double desktop = 1650;
+
+  static bool isCompact(double w) => w < tabletPortrait;
+  static bool isMedium(double w) => w >= tabletPortrait && w < desktop;
+  static bool isExpanded(double w) => w >= desktop;
+}

lib/core/theme/app_layout.dart

@@ -0,0 +1,98 @@
+import 'package:flutter/widgets.dart';
+
+/// How the left navigation should render at the current width.
+enum SidebarMode {
+  /// Off-canvas; reachable through the page-header menu button.
+  drawer,
+
+  /// Icons only, 84px.
+  rail,
+
+  /// Icons plus labels and section headers, 252px.
+  expanded,
+}
+
+/// How the bill should render at the current width.
+enum BillingMode {
+  /// Bottom sheet, opened from the floating cart button.
+  sheet,
+
+  /// Docked column on the right.
+  docked,
+}
+
+/// Resolves every layout decision for the POS dashboard from a single width.
+///
+/// Keeping this in one place means the sidebar, product grid and billing panel
+/// can never disagree about which breakpoint they are in.
+class PosLayout {
+  const PosLayout({
+    required this.sidebar,
+    required this.billing,
+    required this.billingWidth,
+    required this.gridTileExtent,
+    required this.contentPadding,
+  });
+
+  final SidebarMode sidebar;
+  final BillingMode billing;
+  final double billingWidth;
+
+  /// Maximum width of a product card; the grid fits as many as will fit.
+  final double gridTileExtent;
+
+  final double contentPadding;
+
+  static const double railWidth = 84;
+  static const double expandedWidth = 252;
+
+  /// Below this the sidebar goes off-canvas.
+  static const double drawerBelow = 920;
+
+  /// Below this the sidebar is icons-only.
+  static const double railBelow = 1300;
+
+  /// Below this the bill becomes a bottom sheet.
+  static const double sheetBelow = 1120;
+
+  /// Above this we have room for a wider bill and larger cards.
+  static const double wideAbove = 1650;
+
+  factory PosLayout.of(BuildContext context) =>
+      PosLayout.forWidth(MediaQuery.sizeOf(context).width);
+
+  factory PosLayout.forWidth(double width) {
+    final sidebar = width < drawerBelow
+        ? SidebarMode.drawer
+        : (width < railBelow ? SidebarMode.rail : SidebarMode.expanded);
+
+    final billing =
+        width < sheetBelow ? BillingMode.sheet : BillingMode.docked;
+
+    final billingWidth = width >= wideAbove ? 440.0 : 380.0;
+
+    // Cards stay finger-sized on tablets and grow a little on large desktops.
+    final tile = width < drawerBelow
+        ? 168.0
+        : (width >= wideAbove ? 208.0 : 186.0);
+
+    final padding = width < drawerBelow ? 16.0 : 24.0;
+
+    return PosLayout(
+      sidebar: sidebar,
+      billing: billing,
+      billingWidth: billingWidth,
+      gridTileExtent: tile,
+      contentPadding: padding,
+    );
+  }
+
+  double get sidebarWidth => switch (sidebar) {
+        SidebarMode.drawer => 0,
+        SidebarMode.rail => railWidth,
+        SidebarMode.expanded => expandedWidth,
+      };
+
+  bool get sidebarIsDrawer => sidebar == SidebarMode.drawer;
+  bool get billingIsSheet => billing == BillingMode.sheet;
+}

lib/core/theme/app_theme.dart

@@ -0,0 +1,162 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+import 'app_colors.dart';
+import 'app_dimens.dart';
+import 'app_typography.dart';
+
+/// Builds the single source of truth [ThemeData] for Nearle POS.
+class AppTheme {
+  const AppTheme._();
+
+  static ThemeData get light {
+    final colorScheme = ColorScheme.fromSeed(
+      seedColor: AppColors.primary,
+      primary: AppColors.primary,
+      onPrimary: AppColors.textOnPrimary,
+      secondary: AppColors.primaryLight,
+      surface: AppColors.surface,
+      onSurface: AppColors.textPrimary,
+      error: AppColors.danger,
+      brightness: Brightness.light,
+    );
+
+    return ThemeData(
+      useMaterial3: true,
+      colorScheme: colorScheme,
+      scaffoldBackgroundColor: AppColors.background,
+      textTheme: AppTypography.textTheme,
+      splashFactory: InkSparkle.splashFactory,
+      visualDensity: VisualDensity.standard,
+
+      appBarTheme: AppBarTheme(
+        backgroundColor: AppColors.primary,
+        foregroundColor: AppColors.textOnPrimary,
+        elevation: 0,
+        centerTitle: false,
+        toolbarHeight: AppSizes.headerHeight,
+        systemOverlayStyle: SystemUiOverlayStyle.light,
+        titleTextStyle: AppTypography.textTheme.titleLarge
+            ?.copyWith(color: AppColors.textOnPrimary),
+      ),
+
+      cardTheme: CardThemeData(
+        color: AppColors.surface,
+        elevation: 0,
+        margin: EdgeInsets.zero,
+        shape: RoundedRectangleBorder(
+          borderRadius: AppRadius.brLg,
+          side: const BorderSide(color: AppColors.border),
+        ),
+      ),
+
+      dividerTheme: const DividerThemeData(
+        color: AppColors.divider,
+        thickness: 1,
+        space: 1,
+      ),
+
+      elevatedButtonTheme: ElevatedButtonThemeData(
+        style: ElevatedButton.styleFrom(
+          backgroundColor: AppColors.primary,
+          foregroundColor: AppColors.textOnPrimary,
+          disabledBackgroundColor: AppColors.border,
+          disabledForegroundColor: AppColors.textTertiary,
+          minimumSize: const Size(0, AppSizes.buttonHeight),
+          padding: const EdgeInsets.symmetric(horizontal: AppSpacing.xxl),
+          elevation: 0,
+          shape: const RoundedRectangleBorder(borderRadius: AppRadius.brMd),
+          textStyle: AppTypography.textTheme.labelLarge,
+        ),
+      ),
+
+      outlinedButtonTheme: OutlinedButtonThemeData(
+        style: OutlinedButton.styleFrom(
+          foregroundColor: AppColors.primary,
+          minimumSize: const Size(0, AppSizes.buttonHeight),
+          padding: const EdgeInsets.symmetric(horizontal: AppSpacing.xxl),
+          side: const BorderSide(color: AppColors.primaryBorder, width: 1.5),
+          shape: const RoundedRectangleBorder(borderRadius: AppRadius.brMd),
+          textStyle: AppTypography.textTheme.labelLarge,
+        ),
+      ),
+
+      textButtonTheme: TextButtonThemeData(
+        style: TextButton.styleFrom(
+          foregroundColor: AppColors.primary,
+          minimumSize: const Size(0, AppSizes.touchTarget),
+          padding: const EdgeInsets.symmetric(horizontal: AppSpacing.lg),
+          shape: const RoundedRectangleBorder(borderRadius: AppRadius.brSm),
+          textStyle: AppTypography.textTheme.labelLarge,
+        ),
+      ),
+
+      inputDecorationTheme: InputDecorationTheme(
+        filled: true,
+        fillColor: AppColors.surface,
+        contentPadding: const EdgeInsets.symmetric(
+          horizontal: AppSpacing.lg,
+          vertical: AppSpacing.lg,
+        ),
+        hintStyle: AppTypography.textTheme.bodyMedium
+            ?.copyWith(color: AppColors.textTertiary),
+        labelStyle: AppTypography.textTheme.bodyMedium
+            ?.copyWith(color: AppColors.textSecondary),
+        border: _inputBorder(AppColors.border),
+        enabledBorder: _inputBorder(AppColors.border),
+        focusedBorder: _inputBorder(AppColors.primary, width: 1.8),
+        errorBorder: _inputBorder(AppColors.danger),
+        focusedErrorBorder: _inputBorder(AppColors.danger, width: 1.8),
+      ),
+
+      chipTheme: ChipThemeData(
+        backgroundColor: AppColors.surface,
+        selectedColor: AppColors.primary,
+        side: const BorderSide(color: AppColors.border),
+        labelStyle: AppTypography.textTheme.labelMedium,
+        padding: const EdgeInsets.symmetric(
+          horizontal: AppSpacing.lg,
+          vertical: AppSpacing.md,
+        ),
+        shape: const RoundedRectangleBorder(borderRadius: AppRadius.brPill),
+      ),
+
+      dialogTheme: DialogThemeData(
+        backgroundColor: AppColors.surface,
+        elevation: 0,
+        shape: RoundedRectangleBorder(
+          borderRadius: BorderRadius.circular(AppRadius.xl),
+        ),
+        titleTextStyle: AppTypography.textTheme.headlineSmall,
+      ),
+
+      snackBarTheme: SnackBarThemeData(
+        backgroundColor: AppColors.textPrimary,
+        contentTextStyle: AppTypography.textTheme.bodyMedium
+            ?.copyWith(color: Colors.white),
+        behavior: SnackBarBehavior.floating,
+        shape: const RoundedRectangleBorder(borderRadius: AppRadius.brMd),
+      ),
+
+      scrollbarTheme: ScrollbarThemeData(
+        thickness: WidgetStateProperty.all(6),
+        radius: const Radius.circular(AppRadius.pill),
+        thumbColor: WidgetStateProperty.all(AppColors.primaryBorder),
+      ),
+
+      pageTransitionsTheme: const PageTransitionsTheme(builders: {
+        TargetPlatform.windows: FadeUpwardsPageTransitionsBuilder(),
+        TargetPlatform.macOS: FadeUpwardsPageTransitionsBuilder(),
+        TargetPlatform.linux: FadeUpwardsPageTransitionsBuilder(),
+        TargetPlatform.android: FadeUpwardsPageTransitionsBuilder(),
+      }),
+    );
+  }
+
+  static OutlineInputBorder _inputBorder(Color color, {double width = 1}) {
+    return OutlineInputBorder(
+      borderRadius: AppRadius.brMd,
+      borderSide: BorderSide(color: color, width: width),
+    );
+  }
+}

lib/core/theme/app_typography.dart

@@ -0,0 +1,85 @@
+import 'package:flutter/material.dart';
+import 'package:google_fonts/google_fonts.dart';
+
+import 'app_colors.dart';
+
+/// Poppins-based type scale.
+///
+/// Poppins is geometric and runs slightly wide, so headings get negative
+/// tracking to keep them compact in the sidebar and page header. POS screens
+/// are read at arm's length, so body text starts at 15 rather than the
+/// Material default of 14.
+class AppTypography {
+  const AppTypography._();
+
+  static TextTheme get textTheme {
+    final base = GoogleFonts.poppinsTextTheme();
+
+    return base.copyWith(
+      displayLarge: _s(base.displayLarge, 44, FontWeight.w700, -1.2),
+      displayMedium: _s(base.displayMedium, 36, FontWeight.w700, -1.0),
+      displaySmall: _s(base.displaySmall, 30, FontWeight.w700, -0.8),
+
+      headlineLarge: _s(base.headlineLarge, 28, FontWeight.w600, -0.7),
+      headlineMedium: _s(base.headlineMedium, 24, FontWeight.w600, -0.6),
+      headlineSmall: _s(base.headlineSmall, 20, FontWeight.w600, -0.4),
+
+      titleLarge: _s(base.titleLarge, 18, FontWeight.w600, -0.3),
+      titleMedium: _s(base.titleMedium, 15.5, FontWeight.w600, -0.2),
+      titleSmall: _s(base.titleSmall, 13.5, FontWeight.w600, -0.1),
+
+      bodyLarge: _s(base.bodyLarge, 15.5, FontWeight.w400, 0),
+      bodyMedium: _s(base.bodyMedium, 14.5, FontWeight.w400, 0),
+      bodySmall: _s(base.bodySmall, 12.5, FontWeight.w400, 0,
+          color: AppColors.textSecondary),
+
+      labelLarge: _s(base.labelLarge, 14.5, FontWeight.w600, 0),
+      labelMedium: _s(base.labelMedium, 12.5, FontWeight.w600, 0.1),
+      labelSmall: _s(base.labelSmall, 10.5, FontWeight.w600, 0.6,
+          color: AppColors.textTertiary),
+    );
+  }
+
+  static TextStyle _s(
+    TextStyle? base,
+    double size,
+    FontWeight weight,
+    double tracking, {
+    Color color = AppColors.textPrimary,
+  }) {
+    return (base ?? const TextStyle()).copyWith(
+      fontSize: size,
+      fontWeight: weight,
+      letterSpacing: tracking,
+      color: color,
+      height: 1.35,
+    );
+  }
+
+  /// Tabular figures — essential so totals don't jitter as quantities change.
+  static TextStyle money(double size,
+          {FontWeight weight = FontWeight.w700, Color? color}) =>
+      GoogleFonts.poppins(
+        fontSize: size,
+        fontWeight: weight,
+        color: color ?? AppColors.textPrimary,
+        letterSpacing: -0.5,
+        height: 1.15,
+        fontFeatures: const [FontFeature.tabularFigures()],
+      );
+
+  /// Fixed-pitch, used only for the receipt preview.
+  static TextStyle mono(double size, {Color? color}) => GoogleFonts.robotoMono(
+        fontSize: size,
+        color: color ?? AppColors.textTertiary,
+        letterSpacing: 0.2,
+      );
+
+  /// Small uppercase caption for sidebar section dividers.
+  static TextStyle sectionLabel() => GoogleFonts.poppins(
+        fontSize: 10.5,
+        fontWeight: FontWeight.w600,
+        letterSpacing: 1.0,
+        color: AppColors.textTertiary,
+      );
+}

lib/core/utils/extensions.dart

@@ -0,0 +1,59 @@
+import 'package:flutter/material.dart';
+
+import '../theme/app_dimens.dart';
+
+extension BuildContextX on BuildContext {
+  ThemeData get theme => Theme.of(this);
+  TextTheme get text => Theme.of(this).textTheme;
+  ColorScheme get colors => Theme.of(this).colorScheme;
+
+  Size get screen => MediaQuery.sizeOf(this);
+  double get screenWidth => MediaQuery.sizeOf(this).width;
+  double get screenHeight => MediaQuery.sizeOf(this).height;
+
+  bool get isCompact => AppBreakpoints.isCompact(screenWidth);
+  bool get isMedium => AppBreakpoints.isMedium(screenWidth);
+  bool get isExpanded => AppBreakpoints.isExpanded(screenWidth);
+
+  /// Picks a value appropriate to the current breakpoint.
+  T responsive<T>({required T compact, T? medium, required T expanded}) {
+    if (isCompact) return compact;
+    if (isExpanded) return expanded;
+    return medium ?? expanded;
+  }
+
+  void showSnack(String message, {Color? background}) {
+    ScaffoldMessenger.of(this)
+      ..hideCurrentSnackBar()
+      ..showSnackBar(SnackBar(
+        content: Text(message),
+        backgroundColor: background,
+        duration: const Duration(seconds: 2),
+      ));
+  }
+}
+
+extension DoubleX on double {
+  /// Rounds to two decimals to avoid floating point drift in money maths.
+  double get asMoney => (this * 100).roundToDouble() / 100;
+
+  /// Indian retail round-off to the nearest rupee.
+  double get roundedToRupee => roundToDouble();
+}
+
+extension StringX on String {
+  String get capitalized =>
+      isEmpty ? this : '${this[0].toUpperCase()}${substring(1)}';
+
+  bool containsIgnoreCase(String other) =>
+      toLowerCase().contains(other.toLowerCase());
+}
+
+extension IterableX<T> on Iterable<T> {
+  T? firstWhereOrNull(bool Function(T) test) {
+    for (final element in this) {
+      if (test(element)) return element;
+    }
+    return null;
+  }
+}

lib/core/utils/formatters.dart

@@ -0,0 +1,67 @@
+import 'package:intl/intl.dart';
+
+import '../constants/app_constants.dart';
+
+/// Currency, date and number formatting helpers.
+class Formatters {
+  const Formatters._();
+
+  static final NumberFormat _currency = NumberFormat.currency(
+    locale: AppConstants.locale,
+    symbol: AppConstants.currencySymbol,
+    decimalDigits: 2,
+  );
+
+  static final NumberFormat _compactCurrency = NumberFormat.compactCurrency(
+    locale: AppConstants.locale,
+    symbol: AppConstants.currencySymbol,
+    decimalDigits: 1,
+  );
+
+  static final DateFormat _time = DateFormat('hh:mm a');
+  static final DateFormat _date = DateFormat('dd MMM yyyy');
+  static final DateFormat _dateTime = DateFormat('dd MMM yyyy, hh:mm a');
+  static final DateFormat _receiptStamp = DateFormat('dd/MM/yyyy HH:mm:ss');
+
+  static String money(num value) => _currency.format(value);
+  static String moneyCompact(num value) => _compactCurrency.format(value);
+
+  /// Amount without the symbol — used where the symbol is styled separately.
+  static String amount(num value) => value.toStringAsFixed(2);
+
+  static String time(DateTime dt) => _time.format(dt);
+  static String date(DateTime dt) => _date.format(dt);
+  static String dateTime(DateTime dt) => _dateTime.format(dt);
+  static String receiptStamp(DateTime dt) => _receiptStamp.format(dt);
+
+  static String percent(double fraction) =>
+      '${(fraction * 100).toStringAsFixed(fraction * 100 % 1 == 0 ? 0 : 1)}%';
+
+  /// `9876543210` -> `98765 43210`
+  static String mobile(String raw) {
+    final digits = raw.replaceAll(RegExp(r'\D'), '');
+    if (digits.length != 10) return raw;
+    return '${digits.substring(0, 5)} ${digits.substring(5)}';
+  }
+
+  /// Masks all but the last four digits for on-screen privacy.
+  static String maskedMobile(String raw) {
+    final digits = raw.replaceAll(RegExp(r'\D'), '');
+    if (digits.length < 4) return raw;
+    return '${'\u2022' * (digits.length - 4)}${digits.substring(digits.length - 4)}';
+  }
+
+  static String initials(String name) {
+    final parts = name.trim().split(RegExp(r'\s+')).where((p) => p.isNotEmpty);
+    if (parts.isEmpty) return '?';
+    if (parts.length == 1) return parts.first.substring(0, 1).toUpperCase();
+    return (parts.first.substring(0, 1) + parts.last.substring(0, 1))
+        .toUpperCase();
+  }
+
+  static String invoiceNumber(int sequence, DateTime date) {
+    final y = date.year.toString().substring(2);
+    final m = date.month.toString().padLeft(2, '0');
+    return 'INV-$y$m-${sequence.toString().padLeft(5, '0')}';
+  }
+}

lib/core/utils/validators.dart

@@ -0,0 +1,56 @@
+import '../constants/app_constants.dart';
+
+/// Form field validators returning a message, or null when valid.
+class Validators {
+  const Validators._();
+
+  static final RegExp _emailRe =
+      RegExp(r'^[\w.+-]+@([\w-]+\.)+[A-Za-z]{2,}$');
+  static final RegExp _mobileRe = RegExp(r'^[6-9]\d{9}$');
+
+  static String? mobile(String? value) {
+    final v = (value ?? '').replaceAll(RegExp(r'\D'), '');
+    if (v.isEmpty) return 'Mobile number is required';
+    if (v.length != AppConstants.mobileNumberLength) {
+      return 'Enter all ${AppConstants.mobileNumberLength} digits';
+    }
+    if (!_mobileRe.hasMatch(v)) return 'Enter a valid Indian mobile number';
+    return null;
+  }
+
+  static String? name(String? value) {
+    final v = (value ?? '').trim();
+    if (v.isEmpty) return 'Customer name is required';
+    if (v.length < 2) return 'Name is too short';
+    if (v.length > 60) return 'Name is too long';
+    return null;
+  }
+
+  static String? emailOptional(String? value) {
+    final v = (value ?? '').trim();
+    if (v.isEmpty) return null;
+    if (!_emailRe.hasMatch(v)) return 'Enter a valid email address';
+    return null;
+  }
+
+  static String? dobOptional(DateTime? value) {
+    if (value == null) return null;
+    final now = DateTime.now();
+    if (value.isAfter(now)) return 'Date of birth cannot be in the future';
+    if (now.year - value.year > 120) return 'Enter a valid date of birth';
+    return null;
+  }
+
+  static String? positiveAmount(String? value) {
+    final v = double.tryParse((value ?? '').trim());
+    if (v == null) return 'Enter a valid amount';
+    if (v <= 0) return 'Amount must be greater than zero';
+    return null;
+  }
+
+  static bool isLikelyBarcode(String value) {
+    final v = value.trim();
+    return v.length >= AppConstants.minBarcodeLength &&
+        RegExp(r'^\d+$').hasMatch(v);
+  }
+}

lib/core/widgets/empty_state.dart

@@ -0,0 +1,72 @@
+import 'package:flutter/material.dart';
+
+import '../theme/app_colors.dart';
+import '../theme/app_dimens.dart';
+
+class EmptyState extends StatelessWidget {
+  const EmptyState({
+    super.key,
+    required this.title,
+    this.message,
+    this.emoji = '🛒',
+    this.action,
+    this.compact = false,
+  });
+
+  final String title;
+  final String? message;
+  final String emoji;
+  final Widget? action;
+  final bool compact;
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Padding(
+        padding: const EdgeInsets.all(AppSpacing.xxl),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Container(
+              width: compact ? 64 : 96,
+              height: compact ? 64 : 96,
+              decoration: const BoxDecoration(
+                color: AppColors.primarySurface,
+                shape: BoxShape.circle,
+              ),
+              alignment: Alignment.center,
+              child: Text(emoji,
+                  style: TextStyle(fontSize: compact ? 28 : 40)),
+            ),
+            SizedBox(height: compact ? AppSpacing.lg : AppSpacing.xxl),
+            Text(
+              title,
+              textAlign: TextAlign.center,
+              style: TextStyle(
+                fontSize: compact ? 15 : 18,
+                fontWeight: FontWeight.w700,
+                color: AppColors.textPrimary,
+              ),
+            ),
+            if (message != null) ...[
+              const SizedBox(height: AppSpacing.sm),
+              Text(
+                message!,
+                textAlign: TextAlign.center,
+                style: const TextStyle(
+                  fontSize: 14,
+                  color: AppColors.textSecondary,
+                  height: 1.45,
+                ),
+              ),
+            ],
+            if (action != null) ...[
+              const SizedBox(height: AppSpacing.xxl),
+              action!,
+            ],
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/core/widgets/glass_card.dart

@@ -0,0 +1,85 @@
+import 'dart:ui';
+
+import 'package:flutter/material.dart';
+
+import '../theme/app_colors.dart';
+import '../theme/app_dimens.dart';
+
+/// Glassmorphism-inspired surface used for elevated panels and product cards.
+class GlassCard extends StatelessWidget {
+  const GlassCard({
+    super.key,
+    required this.child,
+    this.padding = AppSpacing.card,
+    this.radius = AppRadius.lg,
+    this.blur = 0,
+    this.tinted = false,
+    this.borderColor,
+    this.shadows,
+    this.onTap,
+    this.width,
+    this.height,
+  });
+
+  final Widget child;
+  final EdgeInsetsGeometry padding;
+  final double radius;
+
+  /// Backdrop blur strength. Zero renders an opaque card, which is cheaper and
+  /// is the right default for the dense product grid.
+  final double blur;
+
+  final bool tinted;
+  final Color? borderColor;
+  final List<BoxShadow>? shadows;
+  final VoidCallback? onTap;
+  final double? width;
+  final double? height;
+
+  @override
+  Widget build(BuildContext context) {
+    final borderRadius = BorderRadius.circular(radius);
+
+    Widget surface = AnimatedContainer(
+      duration: AppMotion.fast,
+      width: width,
+      height: height,
+      padding: padding,
+      decoration: BoxDecoration(
+        color: tinted
+            ? AppColors.primarySurface.withValues(alpha: blur > 0 ? 0.75 : 1)
+            : AppColors.surface.withValues(alpha: blur > 0 ? 0.78 : 1),
+        borderRadius: borderRadius,
+        border: Border.all(
+          color: borderColor ??
+              (tinted ? AppColors.primaryBorder : AppColors.border),
+        ),
+        boxShadow: shadows ?? AppColors.shadowSm,
+      ),
+      child: child,
+    );
+
+    if (blur > 0) {
+      surface = ClipRRect(
+        borderRadius: borderRadius,
+        child: BackdropFilter(
+          filter: ImageFilter.blur(sigmaX: blur, sigmaY: blur),
+          child: surface,
+        ),
+      );
+    }
+
+    if (onTap == null) return surface;
+
+    return Material(
+      color: Colors.transparent,
+      child: InkWell(
+        onTap: onTap,
+        borderRadius: borderRadius,
+        splashColor: AppColors.primary.withValues(alpha: 0.08),
+        highlightColor: AppColors.primary.withValues(alpha: 0.04),
+        child: surface,
+      ),
+    );
+  }
+}

lib/core/widgets/numeric_keypad.dart

@@ -0,0 +1,146 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+import '../theme/app_colors.dart';
+import '../theme/app_dimens.dart';
+
+/// Large on-screen keypad for mobile numbers and cash amounts.
+class NumericKeypad extends StatelessWidget {
+  const NumericKeypad({
+    super.key,
+    required this.onKey,
+    required this.onBackspace,
+    this.onClear,
+    this.onSubmit,
+    this.submitLabel,
+    this.allowDecimal = false,
+    this.maxWidth = 360,
+  });
+
+  final ValueChanged<String> onKey;
+  final VoidCallback onBackspace;
+  final VoidCallback? onClear;
+  final VoidCallback? onSubmit;
+  final String? submitLabel;
+  final bool allowDecimal;
+  final double maxWidth;
+
+  @override
+  Widget build(BuildContext context) {
+    return ConstrainedBox(
+      constraints: BoxConstraints(maxWidth: maxWidth),
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          for (final row in const [
+            ['1', '2', '3'],
+            ['4', '5', '6'],
+            ['7', '8', '9'],
+          ])
+            _row(row.map((d) => _digit(d)).toList()),
+          _row([
+            allowDecimal
+                ? _digit('.')
+                : _action(
+                    icon: Icons.clear_all_rounded,
+                    onTap: onClear,
+                    tone: AppColors.textSecondary,
+                  ),
+            _digit('0'),
+            _action(
+              icon: Icons.backspace_outlined,
+              onTap: onBackspace,
+              tone: AppColors.danger,
+            ),
+          ]),
+          if (onSubmit != null) ...[
+            const SizedBox(height: AppSpacing.md),
+            SizedBox(
+              width: double.infinity,
+              height: AppSizes.buttonHeight,
+              child: FilledButton.icon(
+                onPressed: onSubmit,
+                icon: const Icon(Icons.check_rounded),
+                label: Text(submitLabel ?? 'Done'),
+              ),
+            ),
+          ],
+        ],
+      ),
+    );
+  }
+
+  Widget _row(List<Widget> children) => Padding(
+        padding: const EdgeInsets.only(bottom: AppSpacing.md),
+        child: Row(
+          children: [
+            for (var i = 0; i < children.length; i++) ...[
+              Expanded(child: children[i]),
+              if (i != children.length - 1)
+                const SizedBox(width: AppSpacing.md),
+            ],
+          ],
+        ),
+      );
+
+  Widget _digit(String value) => _Key(
+        onTap: () {
+          HapticFeedback.selectionClick();
+          onKey(value);
+        },
+        child: Text(
+          value,
+          style: const TextStyle(
+            fontSize: 26,
+            fontWeight: FontWeight.w600,
+            color: AppColors.textPrimary,
+          ),
+        ),
+      );
+
+  Widget _action({
+    required IconData icon,
+    required VoidCallback? onTap,
+    required Color tone,
+  }) =>
+      _Key(
+        onTap: onTap == null
+            ? null
+            : () {
+                HapticFeedback.lightImpact();
+                onTap();
+              },
+        child: Icon(icon, size: 24, color: tone),
+      );
+}
+
+class _Key extends StatelessWidget {
+  const _Key({required this.child, this.onTap});
+
+  final Widget child;
+  final VoidCallback? onTap;
+
+  @override
+  Widget build(BuildContext context) {
+    return SizedBox(
+      height: AppSizes.keypadKeySize,
+      child: Material(
+        color: AppColors.surface,
+        borderRadius: AppRadius.brMd,
+        child: InkWell(
+          onTap: onTap,
+          borderRadius: AppRadius.brMd,
+          splashColor: AppColors.primary.withValues(alpha: 0.1),
+          child: Container(
+            alignment: Alignment.center,
+            decoration: BoxDecoration(
+              borderRadius: AppRadius.brMd,
+              border: Border.all(color: AppColors.border),
+            ),
+            child: child,
+          ),
+        ),
+      ),
+    );
+  }
+}

lib/core/widgets/primary_button.dart

@@ -0,0 +1,126 @@
+import 'package:flutter/material.dart';
+
+import '../theme/app_colors.dart';
+import '../theme/app_dimens.dart';
+
+enum ButtonTone { primary, neutral, success, danger, ghost }
+
+/// Large, touch-first action button with built-in busy state.
+class PrimaryButton extends StatelessWidget {
+  const PrimaryButton({
+    super.key,
+    required this.label,
+    this.onPressed,
+    this.icon,
+    this.tone = ButtonTone.primary,
+    this.expanded = true,
+    this.large = false,
+    this.busy = false,
+    this.trailing,
+  });
+
+  final String label;
+  final VoidCallback? onPressed;
+  final IconData? icon;
+  final ButtonTone tone;
+  final bool expanded;
+  final bool large;
+  final bool busy;
+
+  /// Optional right-aligned widget, typically the bill total.
+  final Widget? trailing;
+
+  @override
+  Widget build(BuildContext context) {
+    final enabled = onPressed != null && !busy;
+    final (bg, fg, border) = _palette;
+    final height =
+        large ? AppSizes.buttonHeightLarge : AppSizes.buttonHeight;
+
+    final content = busy
+        ? SizedBox(
+            height: 22,
+            width: 22,
+            child: CircularProgressIndicator(strokeWidth: 2.4, color: fg),
+          )
+        : Row(
+            mainAxisSize: expanded ? MainAxisSize.max : MainAxisSize.min,
+            mainAxisAlignment: trailing != null
+                ? MainAxisAlignment.spaceBetween
+                : MainAxisAlignment.center,
+            children: [
+              Row(
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  if (icon != null) ...[
+                    Icon(icon, size: large ? 24 : 20, color: fg),
+                    const SizedBox(width: AppSpacing.sm),
+                  ],
+                  Flexible(
+                    child: Text(
+                      label,
+                      overflow: TextOverflow.ellipsis,
+                      style: TextStyle(
+                        color: fg,
+                        fontSize: large ? 19 : 16,
+                        fontWeight: FontWeight.w700,
+                        letterSpacing: 0.1,
+                      ),
+                    ),
+                  ),
+                ],
+              ),
+              if (trailing != null) trailing!,
+            ],
+          );
+
+    return SizedBox(
+      width: expanded ? double.infinity : null,
+      height: height,
+      child: Material(
+        color: enabled ? bg : AppColors.border,
+        borderRadius: AppRadius.brMd,
+        child: InkWell(
+          onTap: enabled ? onPressed : null,
+          borderRadius: AppRadius.brMd,
+          child: Container(
+            padding: EdgeInsets.symmetric(
+              horizontal: large ? AppSpacing.xxl : AppSpacing.xl,
+            ),
+            decoration: BoxDecoration(
+              borderRadius: AppRadius.brMd,
+              border: border == null
+                  ? null
+                  : Border.all(color: border, width: 1.5),
+            ),
+            alignment: Alignment.center,
+            child: DefaultTextStyle.merge(
+              style: TextStyle(color: enabled ? fg : AppColors.textTertiary),
+              child: content,
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  (Color, Color, Color?) get _palette => switch (tone) {
+        ButtonTone.primary => (
+            AppColors.primary,
+            AppColors.textOnPrimary,
+            null
+          ),
+        ButtonTone.success => (AppColors.success, Colors.white, null),
+        ButtonTone.danger => (AppColors.danger, Colors.white, null),
+        ButtonTone.neutral => (
+            AppColors.surface,
+            AppColors.textPrimary,
+            AppColors.border
+          ),
+        ButtonTone.ghost => (
+            AppColors.primarySurface,
+            AppColors.primary,
+            AppColors.primaryBorder
+          ),
+      };
+}

lib/core/widgets/status_pill.dart

@@ -0,0 +1,95 @@
+import 'package:flutter/material.dart';
+
+import '../theme/app_colors.dart';
+import '../theme/app_dimens.dart';
+import '../../domain/entities/customer.dart';
+
+/// Compact labelled badge — stock states, tiers, live indicator.
+class StatusPill extends StatelessWidget {
+  const StatusPill({
+    super.key,
+    required this.label,
+    this.color = AppColors.primary,
+    this.background,
+    this.icon,
+    this.dense = false,
+  });
+
+  final String label;
+  final Color color;
+  final Color? background;
+  final IconData? icon;
+  final bool dense;
+
+  factory StatusPill.tier(MembershipTier tier, {bool dense = false}) {
+    final color = switch (tier) {
+      MembershipTier.bronze => AppColors.tierBronze,
+      MembershipTier.silver => AppColors.tierSilver,
+      MembershipTier.gold => AppColors.tierGold,
+      MembershipTier.platinum => AppColors.tierPlatinum,
+    };
+    return StatusPill(
+      label: tier.label.toUpperCase(),
+      color: color,
+      background: color.withValues(alpha: 0.12),
+      dense: dense,
+    );
+  }
+
+  factory StatusPill.stock(double stock, {required int lowThreshold}) {
+    if (stock <= 0) {
+      return const StatusPill(
+        label: 'Out of stock',
+        color: AppColors.danger,
+        background: AppColors.dangerSurface,
+        dense: true,
+      );
+    }
+    if (stock <= lowThreshold) {
+      return StatusPill(
+        label: '${stock.toStringAsFixed(0)} left',
+        color: AppColors.warning,
+        background: AppColors.warningSurface,
+        dense: true,
+      );
+    }
+    return StatusPill(
+      label: '${stock.toStringAsFixed(0)} in stock',
+      color: AppColors.textTertiary,
+      background: Colors.transparent,
+      dense: true,
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      padding: EdgeInsets.symmetric(
+        horizontal: dense ? AppSpacing.sm : AppSpacing.md,
+        vertical: dense ? 3 : AppSpacing.xs + 2,
+      ),
+      decoration: BoxDecoration(
+        color: background ?? color.withValues(alpha: 0.12),
+        borderRadius: AppRadius.brPill,
+      ),
+      child: Row(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          if (icon != null) ...[
+            Icon(icon, size: dense ? 11 : 13, color: color),
+            const SizedBox(width: AppSpacing.xs),
+          ],
+          Text(
+            label,
+            style: TextStyle(
+              color: color,
+              fontSize: dense ? 10.5 : 12,
+              fontWeight: FontWeight.w700,
+              letterSpacing: 0.3,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/data/datasources/local_store.dart

@@ -0,0 +1,136 @@
+import '../../domain/entities/customer.dart';
+import '../../domain/entities/product.dart';
+import '../../domain/entities/sync_event.dart';
+import '../../domain/entities/transaction.dart';
+import 'seed_data.dart';
+
+/// On-terminal storage.
+///
+/// The terminal starts with an **empty catalogue**: nothing can be billed
+/// until the cashier imports products. Everything after that — sales, parked
+/// bills, queued events — lives here and survives without a connection.
+///
+/// Swapping this for Hive or SQLite changes nothing above the data layer.
+class LocalStore {
+  LocalStore._();
+
+  static final LocalStore instance = LocalStore._();
+
+  final Map<String, Product> _products = {};
+  final Map<String, Customer> _customers = {};
+  final List<SaleTransaction> _transactions = [];
+  final List<ParkedBill> _parked = [];
+  final List<SyncEvent> _events = [];
+
+  int _invoiceSequence = 0;
+
+  DateTime? _lastImportAt;
+  String? _catalogueRevision;
+
+  /// Nothing to seed — the catalogue arrives via import.
+  Future<void> init() async {}
+
+  /// Test helper. Clears everything and optionally loads the demo catalogue
+  /// so fixtures don't have to run an import first.
+  Future<void> reset({bool withCatalogue = false}) async {
+    _products.clear();
+    _customers.clear();
+    _transactions.clear();
+    _parked.clear();
+    _events.clear();
+    _invoiceSequence = 0;
+    _lastImportAt = null;
+    _catalogueRevision = null;
+
+    if (withCatalogue) {
+      importCatalogue(
+        products: SeedData.products(),
+        customers: SeedData.customers(),
+        revision: 'seed',
+        at: DateTime.now(),
+      );
+    }
+  }
+
+  // -------------------------------------------------------------- Catalogue
+  /// True once a catalogue has been pulled. The POS refuses to bill until so.
+  bool get hasCatalogue => _products.isNotEmpty;
+
+  DateTime? get lastImportAt => _lastImportAt;
+  String? get catalogueRevision => _catalogueRevision;
+
+  /// Replaces the catalogue wholesale.
+  ///
+  /// Stock levels already adjusted by local sales are preserved for products
+  /// that survive the re-import, so importing mid-shift does not resurrect
+  /// stock that has been sold.
+  void importCatalogue({
+    required List<Product> products,
+    required List<Customer> customers,
+    required String revision,
+    required DateTime at,
+  }) {
+    final priorStock = {
+      for (final p in _products.values) p.id: p.stock,
+    };
+
+    _products
+      ..clear()
+      ..addEntries(products.map((p) {
+        final held = priorStock[p.id];
+        return MapEntry(p.id, held == null ? p : p.copyWith(stock: held));
+      }));
+
+    // Locally registered customers must not be wiped by a server pull.
+    for (final c in customers) {
+      _customers.putIfAbsent(c.id, () => c);
+    }
+
+    _lastImportAt = at;
+    _catalogueRevision = revision;
+  }
+
+  // --------------------------------------------------------------- Products
+  List<Product> get products => _products.values.toList(growable: false);
+
+  void putProduct(Product p) => _products[p.id] = p;
+
+  Product? productById(String id) => _products[id];
+
+  // -------------------------------------------------------------- Customers
+  List<Customer> get customers => _customers.values.toList(growable: false);
+
+  void putCustomer(Customer c) => _customers[c.id] = c;
+
+  Customer? customerById(String id) => _customers[id];
+
+  // ----------------------------------------------------------- Transactions
+  List<SaleTransaction> get transactions =>
+      List.unmodifiable(_transactions.reversed);
+
+  void addTransaction(SaleTransaction t) => _transactions.add(t);
+
+  int nextInvoiceSequence() => ++_invoiceSequence;
+
+  // ------------------------------------------------------------ Parked bills
+  List<ParkedBill> get parked => List.unmodifiable(_parked);
+
+  void addParked(ParkedBill b) => _parked.add(b);
+
+  void removeParked(String id) => _parked.removeWhere((b) => b.id == id);
+
+  // ------------------------------------------------------------ Sync events
+  List<SyncEvent> get events => List.unmodifiable(_events.reversed);
+
+  void addEvent(SyncEvent e) => _events.add(e);
+
+  /// Updates in place. Events are never removed, so a failed push stays
+  /// visible and retryable.
+  void updateEvent(SyncEvent e) {
+    final i = _events.indexWhere((x) => x.id == e.id);
+    if (i >= 0) _events[i] = e;
+  }
+
+  bool get hasUnsyncedEvents =>
+      _events.any((e) => e.status != SyncStatus.synced);
+}

lib/data/datasources/remote_catalogue_source.dart

@@ -0,0 +1,98 @@
+import '../../domain/entities/customer.dart';
+import '../../domain/entities/product.dart';
+import 'seed_data.dart';
+
+/// What one catalogue pull returns.
+class CatalogueSnapshot {
+  const CatalogueSnapshot({
+    required this.products,
+    required this.customers,
+    required this.fetchedAt,
+    required this.revision,
+  });
+
+  final List<Product> products;
+  final List<Customer> customers;
+  final DateTime fetchedAt;
+
+  /// Server-side catalogue version, shown so the cashier can tell whether a
+  /// re-import actually changed anything.
+  final String revision;
+}
+
+/// Raised when the catalogue cannot be pulled.
+class CatalogueSyncException implements Exception {
+  const CatalogueSyncException(this.message);
+
+  final String message;
+
+  @override
+  String toString() => message;
+}
+
+/// Stands in for the back-office catalogue API.
+///
+/// The real implementation would issue an HTTP request; the contract is the
+/// same, so only this class changes.
+class RemoteCatalogueSource {
+  RemoteCatalogueSource();
+
+  /// Flipped from Settings to exercise the offline path.
+  bool simulateOffline = false;
+
+  /// Streams progress so the import screen can show a real bar rather than an
+  /// indeterminate spinner.
+  Future<CatalogueSnapshot> fetch({
+    void Function(double progress, String stage)? onProgress,
+  }) async {
+    const stages = [
+      (0.15, 'Contacting server…'),
+      (0.35, 'Authorising terminal…'),
+      (0.60, 'Downloading products…'),
+      (0.85, 'Downloading customers…'),
+      (1.00, 'Writing to local storage…'),
+    ];
+
+    for (final (progress, stage) in stages) {
+      await Future<void>.delayed(const Duration(milliseconds: 320));
+
+      if (simulateOffline) {
+        throw const CatalogueSyncException(
+          'No connection to the catalogue server. '
+          'Check the network and try again.',
+        );
+      }
+
+      onProgress?.call(progress, stage);
+    }
+
+    return CatalogueSnapshot(
+      products: SeedData.products(),
+      customers: SeedData.customers(),
+      fetchedAt: DateTime.now(),
+      revision: 'rev-${DateTime.now().millisecondsSinceEpoch % 100000}',
+    );
+  }
+}
+
+/// Stands in for the back-office reporting API.
+class RemoteReportSink {
+  RemoteReportSink();
+
+  bool simulateOffline = false;
+
+  /// Pushes one payload. Throws on failure so the caller can keep the event
+  /// queued rather than marking it sent.
+  Future<String> push(Map<String, Object?> payload) async {
+    await Future<void>.delayed(const Duration(milliseconds: 900));
+
+    if (simulateOffline) {
+      throw const CatalogueSyncException(
+        'Could not reach the reporting server. '
+        'The report is still saved on this terminal.',
+      );
+    }
+
+    return 'ACK-${DateTime.now().millisecondsSinceEpoch % 1000000}';
+  }
+}

lib/data/datasources/seed_data.dart

@@ -0,0 +1,542 @@
+import '../../domain/entities/customer.dart';
+import '../../domain/entities/product.dart';
+
+/// Demo catalogue and customer book.
+///
+/// Barcodes are valid 13-digit EAN strings beginning with the Indian GS1
+/// prefix `890`, so a real scanner can be tested against this data.
+class SeedData {
+  const SeedData._();
+
+  static List<Product> products() => const [
+        // ------------------------------------------------------------ Dairy
+        Product(
+          id: 'p001',
+          name: 'Amul Milk 1L',
+          barcode: '8901234500011',
+          sku: 'DRY-MLK-1000',
+          category: ProductCategory.dairy,
+          price: 62,
+          mrp: 66,
+          stock: 50,
+          emoji: '🥛',
+          unit: UnitOfMeasure.litre,
+          gstRate: 0.05,
+          brand: 'Amul',
+        ),
+        Product(
+          id: 'p002',
+          name: 'Amul Butter 500g',
+          barcode: '8901234500028',
+          sku: 'DRY-BTR-0500',
+          category: ProductCategory.dairy,
+          price: 245,
+          mrp: 265,
+          stock: 30,
+          emoji: '🧈',
+          gstRate: 0.12,
+          brand: 'Amul',
+        ),
+        Product(
+          id: 'p003',
+          name: 'Curd 400g',
+          barcode: '8901234500035',
+          sku: 'DRY-CRD-0400',
+          category: ProductCategory.dairy,
+          price: 48,
+          mrp: 52,
+          stock: 40,
+          emoji: '🥣',
+          gstRate: 0.05,
+          brand: 'Nandini',
+        ),
+        Product(
+          id: 'p004',
+          name: 'Paneer 200g',
+          barcode: '8901234500042',
+          sku: 'DRY-PNR-0200',
+          category: ProductCategory.dairy,
+          price: 90,
+          stock: 20,
+          emoji: '🧀',
+          gstRate: 0.05,
+          brand: 'Milky Mist',
+        ),
+        Product(
+          id: 'p005',
+          name: 'Cheese Slices 200g',
+          barcode: '8901234500059',
+          sku: 'DRY-CHS-0200',
+          category: ProductCategory.dairy,
+          price: 135,
+          mrp: 145,
+          stock: 25,
+          emoji: '🧀',
+          gstRate: 0.12,
+          brand: 'Britannia',
+        ),
+
+        // ---------------------------------------------------------- Grocery
+        Product(
+          id: 'p010',
+          name: 'Basmati Rice 1kg',
+          barcode: '8901234500110',
+          sku: 'GRO-RCE-1000',
+          category: ProductCategory.grocery,
+          price: 180,
+          mrp: 199,
+          stock: 4,
+          emoji: '🍚',
+          unit: UnitOfMeasure.kilogram,
+          gstRate: 0.05,
+          brand: 'India Gate',
+        ),
+        Product(
+          id: 'p011',
+          name: 'Fortune Oil 1L',
+          barcode: '8901234500127',
+          sku: 'GRO-OIL-1000',
+          category: ProductCategory.grocery,
+          price: 145,
+          mrp: 160,
+          stock: 60,
+          emoji: '🛢️',
+          unit: UnitOfMeasure.litre,
+          gstRate: 0.05,
+          brand: 'Fortune',
+        ),
+        Product(
+          id: 'p012',
+          name: 'Toor Dal 500g',
+          barcode: '8901234500134',
+          sku: 'GRO-DAL-0500',
+          category: ProductCategory.grocery,
+          price: 90,
+          stock: 45,
+          emoji: '🫘',
+          gstRate: 0.05,
+          brand: 'Tata Sampann',
+        ),
+        Product(
+          id: 'p013',
+          name: 'Aashirvaad Atta 5kg',
+          barcode: '8901234500141',
+          sku: 'GRO-ATA-5000',
+          category: ProductCategory.grocery,
+          price: 285,
+          mrp: 310,
+          stock: 35,
+          emoji: '🌾',
+          unit: UnitOfMeasure.kilogram,
+          gstRate: 0.05,
+          brand: 'Aashirvaad',
+        ),
+        Product(
+          id: 'p014',
+          name: 'Sugar 1kg',
+          barcode: '8901234500158',
+          sku: 'GRO-SGR-1000',
+          category: ProductCategory.grocery,
+          price: 48,
+          stock: 80,
+          emoji: '🍬',
+          unit: UnitOfMeasure.kilogram,
+          gstRate: 0.05,
+        ),
+        Product(
+          id: 'p015',
+          name: 'Maggi 2-min',
+          barcode: '8901234500165',
+          sku: 'GRO-MAG-0070',
+          category: ProductCategory.grocery,
+          price: 14,
+          stock: 120,
+          emoji: '🍜',
+          gstRate: 0.12,
+          brand: 'Nestlé',
+        ),
+        Product(
+          id: 'p016',
+          name: 'Tata Salt 1kg',
+          barcode: '8901234500172',
+          sku: 'GRO-SLT-1000',
+          category: ProductCategory.grocery,
+          price: 28,
+          stock: 95,
+          emoji: '🧂',
+          unit: UnitOfMeasure.kilogram,
+          gstRate: 0.05,
+          brand: 'Tata',
+        ),
+
+        // -------------------------------------------------------- Beverages
+        Product(
+          id: 'p020',
+          name: 'Coca-Cola 600ml',
+          barcode: '8901234500219',
+          sku: 'BEV-COK-0600',
+          category: ProductCategory.beverages,
+          price: 40,
+          stock: 80,
+          emoji: '🥤',
+          unit: UnitOfMeasure.millilitre,
+          gstRate: 0.28,
+          brand: 'Coca-Cola',
+        ),
+        Product(
+          id: 'p021',
+          name: 'Frooti 250ml',
+          barcode: '8901234500226',
+          sku: 'BEV-FRT-0250',
+          category: ProductCategory.beverages,
+          price: 15,
+          stock: 100,
+          emoji: '🥭',
+          gstRate: 0.12,
+          brand: 'Parle Agro',
+        ),
+        Product(
+          id: 'p022',
+          name: 'Bisleri 1L',
+          barcode: '8901234500233',
+          sku: 'BEV-WTR-1000',
+          category: ProductCategory.beverages,
+          price: 20,
+          stock: 150,
+          emoji: '💧',
+          unit: UnitOfMeasure.litre,
+          gstRate: 0.18,
+          brand: 'Bisleri',
+        ),
+        Product(
+          id: 'p023',
+          name: 'Red Bull 250ml',
+          barcode: '8901234500240',
+          sku: 'BEV-RBL-0250',
+          category: ProductCategory.beverages,
+          price: 125,
+          stock: 40,
+          emoji: '🔋',
+          gstRate: 0.28,
+          brand: 'Red Bull',
+        ),
+        Product(
+          id: 'p024',
+          name: 'Bru Coffee 100g',
+          barcode: '8901234500257',
+          sku: 'BEV-COF-0100',
+          category: ProductCategory.beverages,
+          price: 165,
+          mrp: 180,
+          stock: 30,
+          emoji: '☕',
+          gstRate: 0.18,
+          brand: 'Bru',
+        ),
+
+        // ----------------------------------------------------------- Snacks
+        Product(
+          id: 'p030',
+          name: 'Parle-G 800g',
+          barcode: '8901234500318',
+          sku: 'SNK-PGB-0800',
+          category: ProductCategory.snacks,
+          price: 40,
+          stock: 90,
+          emoji: '🍪',
+          gstRate: 0.18,
+          brand: 'Parle',
+        ),
+        Product(
+          id: 'p031',
+          name: "Lay's Chips 26g",
+          barcode: '8901234500325',
+          sku: 'SNK-LAY-0026',
+          category: ProductCategory.snacks,
+          price: 20,
+          stock: 110,
+          emoji: '🥔',
+          gstRate: 0.18,
+          brand: "Lay's",
+        ),
+        Product(
+          id: 'p032',
+          name: 'Dairy Milk 55g',
+          barcode: '8901234500332',
+          sku: 'SNK-DMK-0055',
+          category: ProductCategory.snacks,
+          price: 45,
+          stock: 75,
+          emoji: '🍫',
+          gstRate: 0.18,
+          brand: 'Cadbury',
+        ),
+        Product(
+          id: 'p033',
+          name: 'Good Day 200g',
+          barcode: '8901234500349',
+          sku: 'SNK-GDY-0200',
+          category: ProductCategory.snacks,
+          price: 35,
+          stock: 85,
+          emoji: '🍪',
+          gstRate: 0.18,
+          brand: 'Britannia',
+        ),
+        Product(
+          id: 'p034',
+          name: 'Haldiram Mixture 200g',
+          barcode: '8901234500356',
+          sku: 'SNK-HMX-0200',
+          category: ProductCategory.snacks,
+          price: 55,
+          stock: 60,
+          emoji: '🥜',
+          gstRate: 0.12,
+          brand: 'Haldiram',
+        ),
+
+        // ---------------------------------------------------- Personal care
+        Product(
+          id: 'p040',
+          name: 'Colgate 200g',
+          barcode: '8901234500417',
+          sku: 'PER-CLG-0200',
+          category: ProductCategory.personalCare,
+          price: 110,
+          mrp: 125,
+          stock: 55,
+          emoji: '🪥',
+          gstRate: 0.18,
+          brand: 'Colgate',
+        ),
+        Product(
+          id: 'p041',
+          name: 'Dove Soap 100g',
+          barcode: '8901234500424',
+          sku: 'PER-DVE-0100',
+          category: ProductCategory.personalCare,
+          price: 65,
+          stock: 70,
+          emoji: '🧼',
+          gstRate: 0.18,
+          brand: 'Dove',
+        ),
+        Product(
+          id: 'p042',
+          name: 'Head & Shoulders 340ml',
+          barcode: '8901234500431',
+          sku: 'PER-HNS-0340',
+          category: ProductCategory.personalCare,
+          price: 385,
+          mrp: 420,
+          stock: 25,
+          emoji: '🧴',
+          gstRate: 0.18,
+          brand: 'P&G',
+        ),
+        Product(
+          id: 'p043',
+          name: 'Nivea Lotion 200ml',
+          barcode: '8901234500448',
+          sku: 'PER-NVA-0200',
+          category: ProductCategory.personalCare,
+          price: 240,
+          stock: 30,
+          emoji: '🧴',
+          gstRate: 0.18,
+          brand: 'Nivea',
+        ),
+
+        // -------------------------------------------------------- Household
+        Product(
+          id: 'p050',
+          name: 'Surf Excel 1kg',
+          barcode: '8901234500516',
+          sku: 'HSE-SRF-1000',
+          category: ProductCategory.household,
+          price: 165,
+          mrp: 180,
+          stock: 45,
+          emoji: '🧺',
+          unit: UnitOfMeasure.kilogram,
+          gstRate: 0.18,
+          brand: 'Surf Excel',
+        ),
+        Product(
+          id: 'p051',
+          name: 'Vim Bar 300g',
+          barcode: '8901234500523',
+          sku: 'HSE-VIM-0300',
+          category: ProductCategory.household,
+          price: 30,
+          stock: 90,
+          emoji: '🧽',
+          gstRate: 0.18,
+          brand: 'Vim',
+        ),
+        Product(
+          id: 'p052',
+          name: 'Harpic 500ml',
+          barcode: '8901234500530',
+          sku: 'HSE-HRP-0500',
+          category: ProductCategory.household,
+          price: 98,
+          stock: 40,
+          emoji: '🧴',
+          gstRate: 0.18,
+          brand: 'Harpic',
+        ),
+        Product(
+          id: 'p053',
+          name: 'Garbage Bags 30pc',
+          barcode: '8901234500547',
+          sku: 'HSE-GBG-0030',
+          category: ProductCategory.household,
+          price: 145,
+          stock: 35,
+          emoji: '🗑️',
+          gstRate: 0.18,
+        ),
+
+        // ----------------------------------------------------------- Fruits
+        Product(
+          id: 'p060',
+          name: 'Banana 1kg',
+          barcode: '8901234500615',
+          sku: 'FRT-BAN-1000',
+          category: ProductCategory.fruits,
+          price: 55,
+          stock: 40,
+          emoji: '🍌',
+          unit: UnitOfMeasure.kilogram,
+          gstRate: 0,
+        ),
+        Product(
+          id: 'p061',
+          name: 'Apple Shimla 1kg',
+          barcode: '8901234500622',
+          sku: 'FRT-APL-1000',
+          category: ProductCategory.fruits,
+          price: 180,
+          stock: 25,
+          emoji: '🍎',
+          unit: UnitOfMeasure.kilogram,
+          gstRate: 0,
+        ),
+        Product(
+          id: 'p062',
+          name: 'Alphonso Mango 1kg',
+          barcode: '8901234500639',
+          sku: 'FRT-MNG-1000',
+          category: ProductCategory.fruits,
+          price: 320,
+          stock: 15,
+          emoji: '🥭',
+          unit: UnitOfMeasure.kilogram,
+          gstRate: 0,
+        ),
+
+        // ------------------------------------------------------- Vegetables
+        Product(
+          id: 'p070',
+          name: 'Tomato 1kg',
+          barcode: '8901234500714',
+          sku: 'VEG-TOM-1000',
+          category: ProductCategory.vegetables,
+          price: 40,
+          stock: 50,
+          emoji: '🍅',
+          unit: UnitOfMeasure.kilogram,
+          gstRate: 0,
+        ),
+        Product(
+          id: 'p071',
+          name: 'Onion 1kg',
+          barcode: '8901234500721',
+          sku: 'VEG-ONI-1000',
+          category: ProductCategory.vegetables,
+          price: 35,
+          stock: 65,
+          emoji: '🧅',
+          unit: UnitOfMeasure.kilogram,
+          gstRate: 0,
+        ),
+        Product(
+          id: 'p072',
+          name: 'Potato 1kg',
+          barcode: '8901234500738',
+          sku: 'VEG-POT-1000',
+          category: ProductCategory.vegetables,
+          price: 30,
+          stock: 70,
+          emoji: '🥔',
+          unit: UnitOfMeasure.kilogram,
+          gstRate: 0,
+        ),
+        Product(
+          id: 'p073',
+          name: 'Carrot 500g',
+          barcode: '8901234500745',
+          sku: 'VEG-CAR-0500',
+          category: ProductCategory.vegetables,
+          price: 32,
+          stock: 8,
+          emoji: '🥕',
+          gstRate: 0,
+        ),
+      ];
+
+  static List<Customer> customers() => [
+        Customer(
+          id: 'c001',
+          name: 'Abhishek',
+          mobile: '9876543210',
+          email: 'abhishek@example.com',
+          gender: Gender.male,
+          dateOfBirth: DateTime(1994, 3, 18),
+          loyaltyPoints: 320,
+          lifetimeSpend: 24500,
+          visitCount: 41,
+          createdAt: DateTime(2024, 1, 12),
+          lastVisitAt: DateTime.now().subtract(const Duration(days: 3)),
+        ),
+        Customer(
+          id: 'c002',
+          name: 'Priya Raman',
+          mobile: '9812345678',
+          email: 'priya.r@example.com',
+          gender: Gender.female,
+          dateOfBirth: DateTime(1990, 7, 2),
+          loyaltyPoints: 1180,
+          lifetimeSpend: 68200,
+          visitCount: 96,
+          createdAt: DateTime(2023, 6, 4),
+          lastVisitAt: DateTime.now().subtract(const Duration(days: 1)),
+        ),
+        Customer(
+          id: 'c003',
+          name: 'Karthik S',
+          mobile: '9900112233',
+          gender: Gender.male,
+          loyaltyPoints: 45,
+          lifetimeSpend: 3200,
+          visitCount: 7,
+          createdAt: DateTime(2025, 2, 20),
+          lastVisitAt: DateTime.now().subtract(const Duration(days: 11)),
+        ),
+        Customer(
+          id: 'c004',
+          name: 'Meena Lakshmi',
+          mobile: '9445566778',
+          email: 'meena.l@example.com',
+          gender: Gender.female,
+          dateOfBirth: DateTime(1986, 11, 30),
+          loyaltyPoints: 2640,
+          lifetimeSpend: 172000,
+          visitCount: 210,
+          createdAt: DateTime(2022, 9, 15),
+          lastVisitAt: DateTime.now().subtract(const Duration(hours: 20)),
+        ),
+      ];
+}

lib/data/repositories/customer_repository_impl.dart

@@ -0,0 +1,96 @@
+import 'package:uuid/uuid.dart';
+
+import '../../core/utils/extensions.dart';
+import '../../domain/entities/customer.dart';
+import '../../domain/repositories/customer_repository.dart';
+import '../datasources/local_store.dart';
+
+class CustomerRepositoryImpl implements CustomerRepository {
+  CustomerRepositoryImpl(this._store);
+
+  final LocalStore _store;
+  static const _uuid = Uuid();
+
+  String _digits(String v) => v.replaceAll(RegExp(r'\D'), '');
+
+  @override
+  Future<Customer?> findByMobile(String mobile) async {
+    final needle = _digits(mobile);
+    return _store.customers
+        .firstWhereOrNull((c) => _digits(c.mobile) == needle);
+  }
+
+  @override
+  Future<Customer?> findById(String id) async => _store.customerById(id);
+
+  @override
+  Future<Customer> create(Customer customer) async {
+    final existing = await findByMobile(customer.mobile);
+    if (existing != null) {
+      throw StateError('A customer with this mobile number already exists.');
+    }
+    final created = Customer(
+      id: _uuid.v4(),
+      name: customer.name.trim(),
+      mobile: _digits(customer.mobile),
+      email: customer.email?.trim().isEmpty ?? true
+          ? null
+          : customer.email!.trim(),
+      gender: customer.gender,
+      dateOfBirth: customer.dateOfBirth,
+      loyaltyPoints: 0,
+      lifetimeSpend: 0,
+      visitCount: 0,
+      createdAt: DateTime.now(),
+    );
+    _store.putCustomer(created);
+    return created;
+  }
+
+  @override
+  Future<Customer> update(Customer customer) async {
+    _store.putCustomer(customer);
+    return customer;
+  }
+
+  @override
+  Future<Customer> recordSale({
+    required String customerId,
+    required double amount,
+    required int pointsEarned,
+    required int pointsRedeemed,
+  }) async {
+    final current = _store.customerById(customerId);
+    if (current == null) {
+      throw StateError('Customer $customerId not found.');
+    }
+    final updated = current.copyWith(
+      loyaltyPoints:
+          (current.loyaltyPoints - pointsRedeemed + pointsEarned)
+              .clamp(0, 1 << 31),
+      lifetimeSpend: (current.lifetimeSpend + amount).asMoney,
+      visitCount: current.visitCount + 1,
+      lastVisitAt: DateTime.now(),
+    );
+    _store.putCustomer(updated);
+    return updated;
+  }
+
+  @override
+  Future<List<Customer>> search(String query) async {
+    final q = query.trim().toLowerCase();
+    if (q.isEmpty) return recent();
+    return _store.customers
+        .where((c) =>
+            c.name.toLowerCase().contains(q) || _digits(c.mobile).contains(q))
+        .toList();
+  }
+
+  @override
+  Future<List<Customer>> recent({int limit = 20}) async {
+    final list = _store.customers.toList()
+      ..sort((a, b) => (b.lastVisitAt ?? DateTime(2000))
+          .compareTo(a.lastVisitAt ?? DateTime(2000)));
+    return list.take(limit).toList();
+  }
+}

lib/data/repositories/product_repository_impl.dart

@@ -0,0 +1,68 @@
+import '../../core/utils/extensions.dart';
+import '../../domain/entities/product.dart';
+import '../../domain/repositories/product_repository.dart';
+import '../datasources/local_store.dart';
+
+class ProductRepositoryImpl implements ProductRepository {
+  ProductRepositoryImpl(this._store);
+
+  final LocalStore _store;
+
+  @override
+  Future<List<Product>> getAll() async =>
+      _store.products.where((p) => p.isActive).toList();
+
+  @override
+  Future<List<Product>> getByCategory(ProductCategory category) async =>
+      _store.products
+          .where((p) => p.isActive && p.category == category)
+          .toList();
+
+  @override
+  Future<Product?> findByBarcode(String barcode) async {
+    final needle = barcode.trim();
+    return _store.products.firstWhereOrNull(
+      (p) => p.barcode == needle && p.isActive,
+    );
+  }
+
+  @override
+  Future<Product?> findById(String id) async => _store.productById(id);
+
+  @override
+  Future<List<Product>> search(String query) async {
+    final q = query.trim();
+    if (q.isEmpty) return getAll();
+
+    final results = _store.products.where((p) => p.isActive && p.matches(q));
+
+    // Rank exact barcode and SKU hits above fuzzy name matches so the top
+    // result is the one the cashier almost certainly meant.
+    final ranked = results.toList()
+      ..sort((a, b) => _score(b, q).compareTo(_score(a, q)));
+    return ranked;
+  }
+
+  int _score(Product p, String q) {
+    final lq = q.toLowerCase();
+    if (p.barcode == q) return 100;
+    if (p.sku.toLowerCase() == lq) return 90;
+    if (p.name.toLowerCase().startsWith(lq)) return 70;
+    if (p.name.toLowerCase().contains(lq)) return 50;
+    if (p.brand?.toLowerCase().contains(lq) ?? false) return 30;
+    return 10;
+  }
+
+  @override
+  Future<void> decrementStock(Map<String, double> quantities) async {
+    quantities.forEach((id, qty) {
+      final p = _store.productById(id);
+      if (p == null) return;
+      final next = (p.stock - qty).clamp(0, double.infinity).toDouble();
+      _store.putProduct(p.copyWith(stock: next));
+    });
+  }
+
+  @override
+  Future<void> upsert(Product product) async => _store.putProduct(product);
+}

lib/data/repositories/sync_repository_impl.dart

@@ -0,0 +1,159 @@
+import 'package:uuid/uuid.dart';
+
+import '../../core/utils/formatters.dart';
+import '../../domain/entities/shift_report.dart';
+import '../../domain/entities/sync_event.dart';
+import '../../domain/repositories/sync_repository.dart';
+import '../datasources/local_store.dart';
+import '../datasources/remote_catalogue_source.dart';
+
+class SyncRepositoryImpl implements SyncRepository {
+  SyncRepositoryImpl(this._store, this._catalogue, this._reports);
+
+  final LocalStore _store;
+  final RemoteCatalogueSource _catalogue;
+  final RemoteReportSink _reports;
+
+  static const _uuid = Uuid();
+
+  @override
+  bool get hasCatalogue => _store.hasCatalogue;
+
+  @override
+  DateTime? get lastImportAt => _store.lastImportAt;
+
+  @override
+  String? get catalogueRevision => _store.catalogueRevision;
+
+  @override
+  List<SyncEvent> get events => _store.events;
+
+  @override
+  bool get hasUnsyncedEvents => _store.hasUnsyncedEvents;
+
+  @override
+  Future<SyncEvent> importCatalogue({
+    void Function(double progress, String stage)? onProgress,
+  }) async {
+    final event = SyncEvent(
+      id: _uuid.v4(),
+      type: SyncEventType.catalogueImport,
+      status: SyncStatus.syncing,
+      createdAt: DateTime.now(),
+      summary: 'Catalogue import started',
+    );
+    _store.addEvent(event);
+
+    try {
+      final snapshot = await _catalogue.fetch(onProgress: onProgress);
+
+      _store.importCatalogue(
+        products: snapshot.products,
+        customers: snapshot.customers,
+        revision: snapshot.revision,
+        at: snapshot.fetchedAt,
+      );
+
+      final done = event.copyWith(
+        status: SyncStatus.synced,
+        syncedAt: DateTime.now(),
+        attempts: 1,
+      );
+      final settled = SyncEvent(
+        id: done.id,
+        type: done.type,
+        status: done.status,
+        createdAt: done.createdAt,
+        summary: '${snapshot.products.length} products, '
+            '${snapshot.customers.length} customers · ${snapshot.revision}',
+        payload: {
+          'products': snapshot.products.length,
+          'customers': snapshot.customers.length,
+          'revision': snapshot.revision,
+        },
+        syncedAt: done.syncedAt,
+        attempts: 1,
+      );
+      _store.updateEvent(settled);
+      return settled;
+    } catch (e) {
+      final failed = event.copyWith(
+        status: SyncStatus.failed,
+        error: e.toString(),
+        attempts: 1,
+      );
+      _store.updateEvent(failed);
+      return failed;
+    }
+  }
+
+  @override
+  ShiftReport buildShiftReport({
+    required DateTime businessDate,
+    required String terminalId,
+    required String cashierName,
+  }) {
+    return ShiftReport.fromTransactions(
+      transactions: _store.transactions,
+      businessDate: businessDate,
+      terminalId: terminalId,
+      cashierName: cashierName,
+    );
+  }
+
+  @override
+  Future<SyncEvent> pushShiftReport(ShiftReport report) async {
+    // Queued first, so the data is durable before the network is touched.
+    final queued = SyncEvent(
+      id: _uuid.v4(),
+      type: SyncEventType.shiftReport,
+      status: SyncStatus.pending,
+      createdAt: DateTime.now(),
+      summary: '${report.billCount} bills · '
+          '${Formatters.money(report.grossSales)} · '
+          '${Formatters.date(report.businessDate)}',
+      payload: report.toPayload(),
+    );
+    _store.addEvent(queued);
+
+    return _attempt(queued);
+  }
+
+  @override
+  Future<SyncEvent> retry(String eventId) async {
+    final matches = _store.events.where((e) => e.id == eventId).toList();
+    if (matches.isEmpty) {
+      throw StateError('No queued event with id $eventId');
+    }
+    final event = matches.first;
+    if (event.type == SyncEventType.catalogueImport) {
+      return importCatalogue();
+    }
+    return _attempt(event);
+  }
+
+  /// Sends one event, leaving it queued if the push fails.
+  Future<SyncEvent> _attempt(SyncEvent event) async {
+    _store.updateEvent(event.copyWith(status: SyncStatus.syncing));
+
+    try {
+      await _reports.push(event.payload);
+      final done = event.copyWith(
+        status: SyncStatus.synced,
+        syncedAt: DateTime.now(),
+        attempts: event.attempts + 1,
+        clearError: true,
+      );
+      _store.updateEvent(done);
+      return done.copyWith();
+    } catch (e) {
+      final failed = event.copyWith(
+        status: SyncStatus.failed,
+        error: e.toString(),
+        attempts: event.attempts + 1,
+      );
+      _store.updateEvent(failed);
+      return failed;
+    }
+  }
+}

lib/data/repositories/transaction_repository_impl.dart

@@ -0,0 +1,49 @@
+import '../../core/utils/extensions.dart';
+import '../../domain/entities/transaction.dart';
+import '../../domain/repositories/transaction_repository.dart';
+import '../datasources/local_store.dart';
+
+class TransactionRepositoryImpl implements TransactionRepository {
+  TransactionRepositoryImpl(this._store);
+
+  final LocalStore _store;
+
+  @override
+  Future<SaleTransaction> save(SaleTransaction transaction) async {
+    _store.addTransaction(transaction);
+    return transaction;
+  }
+
+  @override
+  Future<List<SaleTransaction>> history({int limit = 50}) async =>
+      _store.transactions.take(limit).toList();
+
+  @override
+  Future<SaleTransaction?> findByInvoice(String invoiceNumber) async =>
+      _store.transactions
+          .firstWhereOrNull((t) => t.invoiceNumber == invoiceNumber);
+
+  @override
+  Future<int> nextInvoiceSequence() async => _store.nextInvoiceSequence();
+
+  @override
+  Future<void> park(ParkedBill bill) async => _store.addParked(bill);
+
+  @override
+  Future<List<ParkedBill>> parkedBills() async => _store.parked;
+
+  @override
+  Future<void> removeParked(String id) async => _store.removeParked(id);
+
+  @override
+  Future<double> salesTotalForDay(DateTime day) async {
+    return _store.transactions
+        .where((t) =>
+            t.status == TransactionStatus.completed &&
+            t.createdAt.year == day.year &&
+            t.createdAt.month == day.month &&
+            t.createdAt.day == day.day)
+        .fold(0.0, (sum, t) => sum + t.total)
+        .asMoney;
+  }
+}

lib/domain/entities/cart.dart

@@ -0,0 +1,238 @@
+import 'package:equatable/equatable.dart';
+
+import '../../core/constants/app_constants.dart';
+import '../../core/utils/extensions.dart';
+import 'customer.dart';
+import 'product.dart';
+
+/// How a discount value should be interpreted.
+enum DiscountType { none, percentage, flat }
+
+/// A discount applied to a single line or to the whole bill.
+class Discount extends Equatable {
+  const Discount({this.type = DiscountType.none, this.value = 0, this.reason});
+
+  final DiscountType type;
+  final double value;
+  final String? reason;
+
+  static const Discount none = Discount();
+
+  bool get isActive => type != DiscountType.none && value > 0;
+
+  /// Resolves the discount to rupees against [base], never exceeding it.
+  double amountOn(double base) {
+    if (!isActive || base <= 0) return 0;
+    final raw = switch (type) {
+      DiscountType.percentage => base * (value / 100),
+      DiscountType.flat => value,
+      DiscountType.none => 0.0,
+    };
+    return raw.clamp(0, base).toDouble().asMoney;
+  }
+
+  String get label => switch (type) {
+        DiscountType.percentage => '${value.toStringAsFixed(0)}% off',
+        DiscountType.flat => 'Flat ${AppConstants.currencySymbol}$value off',
+        DiscountType.none => 'No discount',
+      };
+
+  @override
+  List<Object?> get props => [type, value, reason];
+}
+
+/// One product line inside the cart.
+class CartLine extends Equatable {
+  const CartLine({
+    required this.product,
+    required this.quantity,
+    this.discount = Discount.none,
+    this.addedAt,
+  });
+
+  final Product product;
+  final double quantity;
+  final Discount discount;
+  final DateTime? addedAt;
+
+  String get id => product.id;
+
+  /// Line value before discount, GST inclusive.
+  double get grossAmount => (product.price * quantity).asMoney;
+
+  double get discountAmount => discount.amountOn(grossAmount);
+
+  /// Payable for this line after discount, GST inclusive.
+  double get payable => (grossAmount - discountAmount).asMoney;
+
+  /// Taxable value inside [payable].
+  double get taxableValue => (payable / (1 + product.gstRate)).asMoney;
+
+  /// GST rupees inside [payable].
+  double get taxAmount => (payable - taxableValue).asMoney;
+
+  double get cgst => (taxAmount / 2).asMoney;
+  double get sgst => (taxAmount / 2).asMoney;
+
+  double get mrpSavings => product.hasDiscount
+      ? (product.savings * quantity).asMoney
+      : 0;
+
+  bool get exceedsStock => quantity > product.stock;
+
+  CartLine copyWith({double? quantity, Discount? discount}) => CartLine(
+        product: product,
+        quantity: quantity ?? this.quantity,
+        discount: discount ?? this.discount,
+        addedAt: addedAt,
+      );
+
+  @override
+  List<Object?> get props => [product.id, quantity, discount];
+}
+
+/// The live bill. Immutable — every mutation returns a new instance, which
+/// keeps the Riverpod notifier predictable and makes undo trivial.
+class Cart extends Equatable {
+  const Cart({
+    this.lines = const [],
+    this.customer,
+    this.billDiscount = Discount.none,
+    this.pointsRedeemed = 0,
+    this.note,
+  });
+
+  final List<CartLine> lines;
+  final Customer? customer;
+  final Discount billDiscount;
+  final int pointsRedeemed;
+  final String? note;
+
+  static const Cart empty = Cart();
+
+  bool get isEmpty => lines.isEmpty;
+  bool get isNotEmpty => lines.isNotEmpty;
+  bool get isWalkIn => customer == null;
+
+  int get lineCount => lines.length;
+
+  double get totalQuantity =>
+      lines.fold(0.0, (sum, l) => sum + l.quantity);
+
+  /// Sum of line values before any bill-level discount, GST inclusive.
+  double get subtotal =>
+      lines.fold(0.0, (sum, l) => sum + l.payable).asMoney;
+
+  /// Discounts applied at the individual line level.
+  double get lineDiscountTotal =>
+      lines.fold(0.0, (sum, l) => sum + l.discountAmount).asMoney;
+
+  /// Automatic discount earned through the customer's membership tier.
+  Discount get membershipDiscount {
+    final rate = customer?.tier.discountRate ?? 0;
+    if (rate <= 0) return Discount.none;
+    return Discount(
+      type: DiscountType.percentage,
+      value: rate * 100,
+      reason: '${customer!.tier.label} member',
+    );
+  }
+
+  double get membershipDiscountAmount =>
+      membershipDiscount.amountOn(subtotal);
+
+  double get manualBillDiscountAmount => billDiscount.amountOn(subtotal);
+
+  /// All bill-level reductions combined.
+  double get billDiscountTotal =>
+      (membershipDiscountAmount + manualBillDiscountAmount)
+          .clamp(0, subtotal)
+          .toDouble()
+          .asMoney;
+
+  double get loyaltyRedemptionValue =>
+      (pointsRedeemed * AppConstants.loyaltyPointValue).asMoney;
+
+  /// Payable after every discount, GST inclusive, before round-off.
+  double get netAmount {
+    final v = subtotal - billDiscountTotal - loyaltyRedemptionValue;
+    return v.clamp(0, double.infinity).toDouble().asMoney;
+  }
+
+  /// Proportion of the bill remaining after bill-level reductions. Used to
+  /// spread those reductions fairly across lines when apportioning GST.
+  double get _billFactor => subtotal <= 0 ? 1 : netAmount / subtotal;
+
+  /// GST payable across the bill, after apportioning bill-level discounts.
+  double get taxAmount =>
+      lines.fold(0.0, (sum, l) => sum + l.taxAmount * _billFactor).asMoney;
+
+  double get cgst => (taxAmount / 2).asMoney;
+  double get sgst => (taxAmount / 2).asMoney;
+
+  /// Taxable value across the bill.
+  double get taxableAmount => (netAmount - taxAmount).asMoney;
+
+  /// GST broken out per slab — required on a compliant tax invoice.
+  Map<double, double> get taxBreakdown {
+    final map = <double, double>{};
+    for (final line in lines) {
+      final rate = line.product.gstRate;
+      map[rate] = ((map[rate] ?? 0) + line.taxAmount * _billFactor).asMoney;
+    }
+    return map;
+  }
+
+  double get grandTotal => netAmount.roundedToRupee;
+
+  /// The paise adjustment shown as "Round Off" on the bill.
+  double get roundOff => (grandTotal - netAmount).asMoney;
+
+  double get mrpSavingsTotal =>
+      lines.fold(0.0, (sum, l) => sum + l.mrpSavings).asMoney;
+
+  /// Everything the shopper saved on this bill.
+  double get totalSavings =>
+      (mrpSavingsTotal + lineDiscountTotal + billDiscountTotal).asMoney;
+
+  /// Points this sale will earn. Walk-in customers earn nothing.
+  int get pointsEarned {
+    if (customer == null) return 0;
+    return (grandTotal / AppConstants.loyaltyRupeesPerPoint).floor();
+  }
+
+  int get maxRedeemablePoints {
+    final c = customer;
+    if (c == null) return 0;
+    final byBalance = c.loyaltyPoints;
+    final byBill =
+        (subtotal - billDiscountTotal) ~/ AppConstants.loyaltyPointValue;
+    return byBalance < byBill ? byBalance : byBill;
+  }
+
+  CartLine? lineFor(String productId) =>
+      lines.firstWhereOrNull((l) => l.product.id == productId);
+
+  bool contains(String productId) => lineFor(productId) != null;
+
+  Cart copyWith({
+    List<CartLine>? lines,
+    Customer? customer,
+    bool clearCustomer = false,
+    Discount? billDiscount,
+    int? pointsRedeemed,
+    String? note,
+  }) {
+    return Cart(
+      lines: lines ?? this.lines,
+      customer: clearCustomer ? null : (customer ?? this.customer),
+      billDiscount: billDiscount ?? this.billDiscount,
+      pointsRedeemed: pointsRedeemed ?? this.pointsRedeemed,
+      note: note ?? this.note,
+    );
+  }
+
+  @override
+  List<Object?> get props =>
+      [lines, customer, billDiscount, pointsRedeemed, note];
+}

lib/domain/entities/customer.dart

@@ -0,0 +1,123 @@
+import 'package:equatable/equatable.dart';
+
+import '../../core/constants/app_constants.dart';
+
+enum Gender {
+  male('Male'),
+  female('Female'),
+  other('Other'),
+  unspecified('Prefer not to say');
+
+  const Gender(this.label);
+
+  final String label;
+}
+
+/// Loyalty tier, derived from lifetime spend.
+enum MembershipTier {
+  bronze('Bronze', 0, 0.0),
+  silver('Silver', 10000, 0.02),
+  gold('Gold', 50000, 0.05),
+  platinum('Platinum', 150000, 0.08);
+
+  const MembershipTier(this.label, this.threshold, this.discountRate);
+
+  final String label;
+
+  /// Lifetime spend in rupees required to reach this tier.
+  final double threshold;
+
+  /// Automatic bill discount granted to members of this tier.
+  final double discountRate;
+
+  static MembershipTier forSpend(double lifetimeSpend) {
+    return MembershipTier.values.lastWhere(
+      (t) => lifetimeSpend >= t.threshold,
+      orElse: () => MembershipTier.bronze,
+    );
+  }
+
+  MembershipTier? get next {
+    final i = index;
+    return i < MembershipTier.values.length - 1
+        ? MembershipTier.values[i + 1]
+        : null;
+  }
+}
+
+/// A registered shopper. A `null` customer on a sale means walk-in.
+class Customer extends Equatable {
+  const Customer({
+    required this.id,
+    required this.name,
+    required this.mobile,
+    this.email,
+    this.gender = Gender.unspecified,
+    this.dateOfBirth,
+    this.loyaltyPoints = 0,
+    this.lifetimeSpend = 0,
+    this.visitCount = 0,
+    this.createdAt,
+    this.lastVisitAt,
+  });
+
+  final String id;
+  final String name;
+  final String mobile;
+  final String? email;
+  final Gender gender;
+  final DateTime? dateOfBirth;
+  final int loyaltyPoints;
+  final double lifetimeSpend;
+  final int visitCount;
+  final DateTime? createdAt;
+  final DateTime? lastVisitAt;
+
+  MembershipTier get tier => MembershipTier.forSpend(lifetimeSpend);
+
+  /// Cash value of the points currently held.
+  double get redeemableValue =>
+      loyaltyPoints * AppConstants.loyaltyPointValue;
+
+  /// Rupees of additional spend needed to reach the next tier.
+  double? get spendToNextTier {
+    final next = tier.next;
+    if (next == null) return null;
+    return (next.threshold - lifetimeSpend).clamp(0, double.infinity);
+  }
+
+  bool get isBirthdayToday {
+    final dob = dateOfBirth;
+    if (dob == null) return false;
+    final now = DateTime.now();
+    return dob.month == now.month && dob.day == now.day;
+  }
+
+  Customer copyWith({
+    String? name,
+    String? email,
+    Gender? gender,
+    DateTime? dateOfBirth,
+    int? loyaltyPoints,
+    double? lifetimeSpend,
+    int? visitCount,
+    DateTime? lastVisitAt,
+  }) {
+    return Customer(
+      id: id,
+      name: name ?? this.name,
+      mobile: mobile,
+      email: email ?? this.email,
+      gender: gender ?? this.gender,
+      dateOfBirth: dateOfBirth ?? this.dateOfBirth,
+      loyaltyPoints: loyaltyPoints ?? this.loyaltyPoints,
+      lifetimeSpend: lifetimeSpend ?? this.lifetimeSpend,
+      visitCount: visitCount ?? this.visitCount,
+      createdAt: createdAt,
+      lastVisitAt: lastVisitAt ?? this.lastVisitAt,
+    );
+  }
+
+  @override
+  List<Object?> get props => [id, name, mobile, loyaltyPoints, lifetimeSpend];
+}

lib/domain/entities/product.dart

@@ -0,0 +1,134 @@
+import 'package:equatable/equatable.dart';
+
+import '../../core/constants/app_constants.dart';
+
+/// Merchandise categories shown as filter chips on the POS dashboard.
+enum ProductCategory {
+  dairy('Dairy', '🥛'),
+  grocery('Grocery', '🛒'),
+  fruits('Fruits', '🍎'),
+  vegetables('Vegetables', '🥦'),
+  beverages('Beverages', '🥤'),
+  snacks('Snacks', '🍪'),
+  personalCare('Personal Care', '🧴'),
+  household('Household', '🏠');
+
+  const ProductCategory(this.label, this.emoji);
+
+  final String label;
+  final String emoji;
+}
+
+/// Unit of measure — drives whether fractional quantities are permitted.
+enum UnitOfMeasure {
+  piece('pc'),
+  kilogram('kg'),
+  gram('g'),
+  litre('L'),
+  millilitre('ml'),
+  pack('pack');
+
+  const UnitOfMeasure(this.symbol);
+
+  final String symbol;
+
+  bool get allowsFractional =>
+      this == UnitOfMeasure.kilogram || this == UnitOfMeasure.litre;
+}
+
+/// A sellable item in the catalogue.
+class Product extends Equatable {
+  const Product({
+    required this.id,
+    required this.name,
+    required this.barcode,
+    required this.sku,
+    required this.category,
+    required this.price,
+    required this.stock,
+    this.mrp,
+    this.emoji = '📦',
+    this.imageUrl,
+    this.unit = UnitOfMeasure.piece,
+    this.gstRate = AppConstants.defaultGstRate,
+    this.brand,
+    this.isActive = true,
+  });
+
+  final String id;
+  final String name;
+  final String barcode;
+  final String sku;
+  final ProductCategory category;
+
+  /// Selling price per [unit], inclusive of GST (Indian retail convention).
+  final double price;
+
+  /// Printed maximum retail price, used to display savings.
+  final double? mrp;
+
+  final double stock;
+  final String emoji;
+  final String? imageUrl;
+  final UnitOfMeasure unit;
+  final double gstRate;
+  final String? brand;
+  final bool isActive;
+
+  bool get isOutOfStock => stock <= 0;
+  bool get isLowStock =>
+      stock > 0 && stock <= AppConstants.lowStockThreshold;
+
+  bool get hasDiscount => mrp != null && mrp! > price;
+
+  double get savings => hasDiscount ? (mrp! - price) : 0;
+
+  double get discountPercent =>
+      hasDiscount ? ((mrp! - price) / mrp!) * 100 : 0;
+
+  /// Price stripped of embedded GST — the taxable value.
+  double get netPrice => price / (1 + gstRate);
+
+  /// GST rupees embedded inside [price].
+  double get taxPerUnit => price - netPrice;
+
+  /// Fuzzy match used by the search bar across name, barcode, SKU and brand.
+  bool matches(String query) {
+    final q = query.trim().toLowerCase();
+    if (q.isEmpty) return true;
+    return name.toLowerCase().contains(q) ||
+        barcode.toLowerCase().contains(q) ||
+        sku.toLowerCase().contains(q) ||
+        (brand?.toLowerCase().contains(q) ?? false) ||
+        category.label.toLowerCase().contains(q);
+  }
+
+  Product copyWith({
+    String? name,
+    double? price,
+    double? mrp,
+    double? stock,
+    ProductCategory? category,
+    bool? isActive,
+  }) {
+    return Product(
+      id: id,
+      name: name ?? this.name,
+      barcode: barcode,
+      sku: sku,
+      category: category ?? this.category,
+      price: price ?? this.price,
+      mrp: mrp ?? this.mrp,
+      stock: stock ?? this.stock,
+      emoji: emoji,
+      imageUrl: imageUrl,
+      unit: unit,
+      gstRate: gstRate,
+      brand: brand,
+      isActive: isActive ?? this.isActive,
+    );
+  }
+
+  @override
+  List<Object?> get props => [id, name, barcode, sku, price, stock, isActive];
+}

lib/domain/entities/shift_report.dart

@@ -0,0 +1,152 @@
+import 'package:equatable/equatable.dart';
+
+import '../../core/utils/extensions.dart';
+import 'transaction.dart';
+
+/// Everything the back office needs from a day at this terminal.
+///
+/// Computed from the locally stored transactions, so it can be produced with
+/// no connection and pushed whenever one is available.
+class ShiftReport extends Equatable {
+  const ShiftReport({
+    required this.businessDate,
+    required this.terminalId,
+    required this.cashierName,
+    required this.billCount,
+    required this.itemCount,
+    required this.grossSales,
+    required this.taxCollected,
+    required this.discountGiven,
+    required this.roundOff,
+    required this.paymentBreakdown,
+    required this.loyaltyPointsIssued,
+    required this.loyaltyPointsRedeemed,
+    this.firstBillAt,
+    this.lastBillAt,
+  });
+
+  final DateTime businessDate;
+  final String terminalId;
+  final String cashierName;
+
+  final int billCount;
+
+  /// Total units sold across every bill.
+  final double itemCount;
+
+  final double grossSales;
+  final double taxCollected;
+  final double discountGiven;
+  final double roundOff;
+
+  final Map<PaymentMethod, double> paymentBreakdown;
+
+  final int loyaltyPointsIssued;
+  final int loyaltyPointsRedeemed;
+
+  final DateTime? firstBillAt;
+  final DateTime? lastBillAt;
+
+  /// A zeroed report for a day with no trading. Not a const — [DateTime]
+  /// cannot appear in a constant expression.
+  factory ShiftReport.blank({
+    required DateTime businessDate,
+    required String terminalId,
+    required String cashierName,
+  }) =>
+      ShiftReport(
+        businessDate: businessDate,
+        terminalId: terminalId,
+        cashierName: cashierName,
+        billCount: 0,
+        itemCount: 0,
+        grossSales: 0,
+        taxCollected: 0,
+        discountGiven: 0,
+        roundOff: 0,
+        paymentBreakdown: const {},
+        loyaltyPointsIssued: 0,
+        loyaltyPointsRedeemed: 0,
+      );
+
+  bool get isEmpty => billCount == 0;
+
+  double get averageBasket =>
+      billCount == 0 ? 0 : (grossSales / billCount).asMoney;
+
+  double get netOfTax => (grossSales - taxCollected).asMoney;
+
+  /// Builds the report from the day's transactions.
+  factory ShiftReport.fromTransactions({
+    required List<SaleTransaction> transactions,
+    required DateTime businessDate,
+    required String terminalId,
+    required String cashierName,
+  }) {
+    final completed = transactions
+        .where((t) =>
+            t.status == TransactionStatus.completed &&
+            t.createdAt.year == businessDate.year &&
+            t.createdAt.month == businessDate.month &&
+            t.createdAt.day == businessDate.day)
+        .toList()
+      ..sort((a, b) => a.createdAt.compareTo(b.createdAt));
+
+    final byMethod = <PaymentMethod, double>{};
+    for (final t in completed) {
+      for (final p in t.payments) {
+        byMethod[p.method] = ((byMethod[p.method] ?? 0) + p.amount).asMoney;
+      }
+    }
+
+    return ShiftReport(
+      businessDate: businessDate,
+      terminalId: terminalId,
+      cashierName: cashierName,
+      billCount: completed.length,
+      itemCount:
+          completed.fold(0.0, (s, t) => s + t.cart.totalQuantity),
+      grossSales: completed.fold(0.0, (s, t) => s + t.total).asMoney,
+      taxCollected:
+          completed.fold(0.0, (s, t) => s + t.cart.taxAmount).asMoney,
+      discountGiven: completed
+          .fold(0.0,
+              (s, t) => s + t.cart.billDiscountTotal + t.cart.lineDiscountTotal)
+          .asMoney,
+      roundOff: completed.fold(0.0, (s, t) => s + t.cart.roundOff).asMoney,
+      paymentBreakdown: byMethod,
+      loyaltyPointsIssued:
+          completed.fold(0, (s, t) => s + t.pointsEarned),
+      loyaltyPointsRedeemed:
+          completed.fold(0, (s, t) => s + t.pointsRedeemed),
+      firstBillAt: completed.isEmpty ? null : completed.first.createdAt,
+      lastBillAt: completed.isEmpty ? null : completed.last.createdAt,
+    );
+  }
+
+  /// The JSON body that would be sent to the back office.
+  Map<String, Object?> toPayload() => {
+        'business_date': businessDate.toIso8601String().substring(0, 10),
+        'terminal_id': terminalId,
+        'cashier': cashierName,
+        'bill_count': billCount,
+        'item_count': itemCount,
+        'gross_sales': grossSales,
+        'net_of_tax': netOfTax,
+        'tax_collected': taxCollected,
+        'discount_given': discountGiven,
+        'round_off': roundOff,
+        'average_basket': averageBasket,
+        'loyalty_points_issued': loyaltyPointsIssued,
+        'loyalty_points_redeemed': loyaltyPointsRedeemed,
+        'first_bill_at': firstBillAt?.toIso8601String(),
+        'last_bill_at': lastBillAt?.toIso8601String(),
+        'payments': {
+          for (final e in paymentBreakdown.entries) e.key.name: e.value,
+        },
+      };
+
+  @override
+  List<Object?> get props =>
+      [businessDate, terminalId, billCount, grossSales];
+}

lib/domain/entities/store_account.dart

@@ -0,0 +1,63 @@
+import 'package:equatable/equatable.dart';
+
+/// What a staff member is allowed to do.
+enum StaffRole {
+  admin('Admin', 'Full access to every module'),
+  manager('Manager', 'Sales, inventory and reports'),
+  cashier('Cashier', 'Billing and customers only');
+
+  const StaffRole(this.label, this.description);
+
+  final String label;
+  final String description;
+
+  bool get canVoidSale => this != StaffRole.cashier;
+  bool get canEditPricing => this == StaffRole.admin;
+  bool get canViewReports => this != StaffRole.cashier;
+}
+
+/// A person who signs in at the terminal.
+class StaffUser extends Equatable {
+  const StaffUser({
+    required this.id,
+    required this.name,
+    required this.role,
+    required this.pin,
+  });
+
+  final String id;
+  final String name;
+  final StaffRole role;
+
+  /// Four-digit quick-unlock code. Never rendered.
+  final String pin;
+
+  @override
+  List<Object?> get props => [id, name, role];
+}
+
+/// The registered outlet this terminal belongs to.
+class StoreAccount extends Equatable {
+  const StoreAccount({
+    required this.id,
+    required this.name,
+    required this.email,
+    required this.address,
+    required this.gstin,
+    required this.phone,
+    required this.staff,
+    this.plan = 'Business',
+  });
+
+  final String id;
+  final String name;
+  final String email;
+  final String address;
+  final String gstin;
+  final String phone;
+  final List<StaffUser> staff;
+  final String plan;
+
+  @override
+  List<Object?> get props => [id, email];
+}

lib/domain/entities/sync_event.dart

@@ -0,0 +1,85 @@
+import 'package:equatable/equatable.dart';
+
+/// The two moments this terminal talks to the server.
+enum SyncEventType {
+  catalogueImport('Catalogue Import', 'Pulled products from the server'),
+  shiftReport('Shift Report', 'Pushed the day\'s takings to the server');
+
+  const SyncEventType(this.label, this.description);
+
+  final String label;
+  final String description;
+
+  bool get isInbound => this == SyncEventType.catalogueImport;
+}
+
+enum SyncStatus {
+  /// Held locally, not yet sent. Nothing is ever discarded in this state.
+  pending('Pending'),
+  syncing('Syncing'),
+  synced('Synced'),
+  failed('Failed');
+
+  const SyncStatus(this.label);
+
+  final String label;
+
+  bool get isTerminal => this == SyncStatus.synced;
+  bool get needsAttention => this == SyncStatus.failed || this == SyncStatus.pending;
+}
+
+/// A durable record of one sync attempt.
+///
+/// Events are never deleted on failure — a failed push stays queued so the
+/// day's takings survive a dropped connection.
+class SyncEvent extends Equatable {
+  const SyncEvent({
+    required this.id,
+    required this.type,
+    required this.status,
+    required this.createdAt,
+    required this.summary,
+    this.payload = const {},
+    this.syncedAt,
+    this.error,
+    this.attempts = 0,
+  });
+
+  final String id;
+  final SyncEventType type;
+  final SyncStatus status;
+  final DateTime createdAt;
+
+  /// One-line description shown in the events log.
+  final String summary;
+
+  /// What would be transmitted. Kept so a retry needs no recomputation.
+  final Map<String, Object?> payload;
+
+  final DateTime? syncedAt;
+  final String? error;
+  final int attempts;
+
+  SyncEvent copyWith({
+    SyncStatus? status,
+    DateTime? syncedAt,
+    String? error,
+    bool clearError = false,
+    int? attempts,
+  }) {
+    return SyncEvent(
+      id: id,
+      type: type,
+      status: status ?? this.status,
+      createdAt: createdAt,
+      summary: summary,
+      payload: payload,
+      syncedAt: syncedAt ?? this.syncedAt,
+      error: clearError ? null : (error ?? this.error),
+      attempts: attempts ?? this.attempts,
+    );
+  }
+
+  @override
+  List<Object?> get props => [id, status, attempts, syncedAt];
+}

lib/domain/entities/transaction.dart

@@ -0,0 +1,133 @@
+import 'package:equatable/equatable.dart';
+
+import '../../core/utils/extensions.dart';
+import 'cart.dart';
+import 'customer.dart';
+
+enum PaymentMethod {
+  cash('Cash', '💵', true),
+  card('Card', '💳', false),
+  upi('UPI', '📱', false),
+  wallet('Wallet', '👛', false),
+  giftCard('Gift Card', '🎁', false),
+  loyalty('Loyalty Points', '⭐', false);
+
+  const PaymentMethod(this.label, this.emoji, this.needsChange);
+
+  final String label;
+  final String emoji;
+
+  /// Only cash tenders can be over-paid and produce change.
+  final bool needsChange;
+
+  /// Non-cash tenders normally capture a reference number.
+  bool get needsReference =>
+      this == PaymentMethod.card ||
+      this == PaymentMethod.upi ||
+      this == PaymentMethod.giftCard;
+}
+
+/// A single tender against a bill. A split payment holds several of these.
+class PaymentSplit extends Equatable {
+  const PaymentSplit({
+    required this.method,
+    required this.amount,
+    this.tendered,
+    this.reference,
+  });
+
+  final PaymentMethod method;
+
+  /// Amount settled by this tender.
+  final double amount;
+
+  /// Cash handed over — may exceed [amount].
+  final double? tendered;
+
+  /// Card approval code, UPI txn id, gift card number.
+  final String? reference;
+
+  double get change {
+    if (!method.needsChange || tendered == null) return 0;
+    final diff = tendered! - amount;
+    return diff > 0 ? diff.asMoney : 0;
+  }
+
+  @override
+  List<Object?> get props => [method, amount, tendered, reference];
+}
+
+enum TransactionStatus { completed, parked, voided, refunded }
+
+/// An immutable record of a finished sale.
+class SaleTransaction extends Equatable {
+  const SaleTransaction({
+    required this.id,
+    required this.invoiceNumber,
+    required this.cart,
+    required this.payments,
+    required this.createdAt,
+    required this.cashierName,
+    this.status = TransactionStatus.completed,
+    this.terminalId = 'TERM-01',
+  });
+
+  final String id;
+  final String invoiceNumber;
+  final Cart cart;
+  final List<PaymentSplit> payments;
+  final DateTime createdAt;
+  final String cashierName;
+  final TransactionStatus status;
+  final String terminalId;
+
+  Customer? get customer => cart.customer;
+
+  double get total => cart.grandTotal;
+
+  double get amountPaid =>
+      payments.fold(0.0, (sum, p) => sum + p.amount).asMoney;
+
+  double get amountTendered => payments
+      .fold(0.0, (sum, p) => sum + (p.tendered ?? p.amount))
+      .asMoney;
+
+  double get changeDue =>
+      payments.fold(0.0, (sum, p) => sum + p.change).asMoney;
+
+  double get balanceDue => (total - amountPaid).clamp(0, double.infinity);
+
+  bool get isFullySettled => balanceDue <= 0.001;
+
+  bool get isSplit => payments.length > 1;
+
+  int get pointsEarned => cart.pointsEarned;
+  int get pointsRedeemed => cart.pointsRedeemed;
+
+  String get paymentSummary =>
+      payments.map((p) => p.method.label).toSet().join(' + ');
+
+  @override
+  List<Object?> get props => [id, invoiceNumber, createdAt, status];
+}
+
+/// A bill set aside so the cashier can serve the next shopper.
+class ParkedBill extends Equatable {
+  const ParkedBill({
+    required this.id,
+    required this.cart,
+    required this.parkedAt,
+    this.label,
+  });
+
+  final String id;
+  final Cart cart;
+  final DateTime parkedAt;
+  final String? label;
+
+  String get displayLabel =>
+      label ?? cart.customer?.name ?? 'Walk-in #${id.substring(0, 4)}';
+
+  @override
+  List<Object?> get props => [id, parkedAt];
+}