feat: standard error handling, web bug fixes, and mock data setup

lib/shared/models/models.dart

@@ -9,6 +9,9 @@ class AddressEntry {
   final IconData icon;
   final Color iconBg;
   final Color iconColor;
+  final double latitude;
+  final double longitude;
+  final String pincode;
 
   const AddressEntry({
     required this.label,
@@ -16,6 +19,9 @@ class AddressEntry {
     required this.icon,
     this.iconBg = AppColors.surfaceContainer,
     this.iconColor = AppColors.onSurfaceVariant,
+    this.latitude = 0.0,
+    this.longitude = 0.0,
+    this.pincode = '',
   });
 }