second commit

lib/core/constants/app_constants.dart

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+/// 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

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+/// 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';
+}