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/features/staff/payments/pubspec.yaml

@@ -11,7 +11,8 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  firebase_data_connect:
+  firebase_data_connect: ^0.2.2+2
+  firebase_auth: ^6.1.4
   flutter_modular: ^6.3.2
   lucide_icons: ^0.257.0
   intl: ^0.20.0
@@ -29,6 +30,8 @@ dependencies:
   krow_data_connect:
     path: ../../../data_connect
 
+  flutter_bloc: any
+  equatable: any
 dev_dependencies:
   flutter_test:
     sdk: flutter