refactor: centralize data connect error handling and resolve build issues across applications

This commit addresses several critical issues across the mobile monorepo:

1. Centralized Error Handling: Integrated DataErrorHandler mixin into all repository implementations, ensuring consistent mapping of Data Connect exceptions to domain AppExceptions.
2. Build Stabilization: Fixed numerous type mismatches, parameter signature errors in widgets (e.g., google_places_flutter itemBuilder), and naming conflicts (StaffSession, FirebaseAuth).
3. Code Quality: Applied 'dart fix' across all modified packages and manually cleared debug print statements and UI clutter.
4. Mono-repo alignment: Standardized Data Connect usage and aliasing ('dc.') for better maintainability.

Signed-off-by: Suriya <suriya@tenext.in>

apps/mobile/packages/design_system/lib/src/ui_colors.dart

@@ -57,6 +57,12 @@ class UiColors {
   /// Focus ring color (#0A39DF)
   static const Color ring = Color(0xFF0A39DF);
 
+  /// Success green color (#10B981)
+  static const Color success = Color(0xFF10B981);
+
+  /// Error red color (#F04444)
+  static const Color error = destructive;
+
   // ---------------------------------------------------------------------------
   // 2. Semantic Mappings
   // ---------------------------------------------------------------------------

apps/mobile/packages/design_system/lib/src/widgets/ui_error_snackbar.dart

@@ -1,5 +1,5 @@
 import 'package:flutter/material.dart';
-import 'package:krow_core_localization/krow_core_localization.dart';
+import 'package:core_localization/core_localization.dart';
 import '../ui_colors.dart';
 import '../ui_typography.dart';
 
@@ -28,14 +28,15 @@ class UiErrorSnackbar {
     String? errorCode,
     Duration duration = const Duration(seconds: 4),
   }) {
-    final texts = Texts.of(context);
-    final message = _getMessageFromKey(texts, messageKey);
+    // 1. Added explicit type 'Translations' to satisfy the lint
+    final Translations texts = Translations.of(context);
+    final String message = _getMessageFromKey(texts, messageKey);
 
     ScaffoldMessenger.of(context).showSnackBar(
       SnackBar(
         content: Row(
           children: [
-            Icon(Icons.error_outline, color: UiColors.white),
+            const Icon(Icons.error_outline, color: UiColors.white),
             const SizedBox(width: 12),
             Expanded(
               child: Column(
@@ -51,7 +52,8 @@ class UiErrorSnackbar {
                     Text(
                       'Error Code: $errorCode',
                       style: UiTypography.footnote2r.copyWith(
-                        color: UiColors.white.withOpacity(0.7),
+                        // 3. Fixed deprecated member use
+                        color: UiColors.white.withValues(alpha: 0.7),
                       ),
                     ),
                   ],
@@ -75,7 +77,7 @@ class UiErrorSnackbar {
   /// - errors.auth.invalid_credentials
   /// - errors.hub.has_orders
   /// - errors.generic.unknown
-  static String _getMessageFromKey(Texts texts, String key) {
+  static String _getMessageFromKey(Translations texts, String key) {
     // Parse key like "errors.auth.invalid_credentials"
     final parts = key.split('.');
     if (parts.length < 2) return texts.errors.generic.unknown;
@@ -102,7 +104,7 @@ class UiErrorSnackbar {
     }
   }
 
-  static String _getAuthError(Texts texts, String key) {
+  static String _getAuthError(Translations texts, String key) {
     switch (key) {
       case 'invalid_credentials':
         return texts.errors.auth.invalid_credentials;
@@ -131,7 +133,7 @@ class UiErrorSnackbar {
     }
   }
 
-  static String _getHubError(Texts texts, String key) {
+  static String _getHubError(Translations texts, String key) {
     switch (key) {
       case 'has_orders':
         return texts.errors.hub.has_orders;
@@ -144,7 +146,7 @@ class UiErrorSnackbar {
     }
   }
 
-  static String _getOrderError(Texts texts, String key) {
+  static String _getOrderError(Translations texts, String key) {
     switch (key) {
       case 'missing_hub':
         return texts.errors.order.missing_hub;
@@ -161,7 +163,7 @@ class UiErrorSnackbar {
     }
   }
 
-  static String _getProfileError(Texts texts, String key) {
+  static String _getProfileError(Translations texts, String key) {
     switch (key) {
       case 'staff_not_found':
         return texts.errors.profile.staff_not_found;
@@ -174,7 +176,7 @@ class UiErrorSnackbar {
     }
   }
 
-  static String _getShiftError(Texts texts, String key) {
+  static String _getShiftError(Translations texts, String key) {
     switch (key) {
       case 'no_open_roles':
         return texts.errors.shift.no_open_roles;
@@ -187,7 +189,7 @@ class UiErrorSnackbar {
     }
   }
 
-  static String _getGenericError(Texts texts, String key) {
+  static String _getGenericError(Translations texts, String key) {
     switch (key) {
       case 'unknown':
         return texts.errors.generic.unknown;

apps/mobile/packages/design_system/pubspec.yaml

@@ -1,6 +1,7 @@
 name: design_system
 description: "A new Flutter package project."
 version: 0.0.1
+publish_to: none
 homepage:
 resolution: workspace
 
@@ -14,6 +15,8 @@ dependencies:
   google_fonts: ^7.0.2
   lucide_icons: ^0.257.0
   font_awesome_flutter: ^10.7.0
+  core_localization:
+    path: ../core_localization
 
 dev_dependencies:
   flutter_test:

apps/mobile/packages/design_system/test/design_system_test.dart

@@ -1,12 +0,0 @@
-import 'package:flutter_test/flutter_test.dart';
-
-import 'package:design_system/design_system.dart';
-
-void main() {
-  test('adds one to input values', () {
-    final calculator = Calculator();
-    expect(calculator.addOne(2), 3);
-    expect(calculator.addOne(-7), -6);
-    expect(calculator.addOne(0), 1);
-  });
-}