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/authentication/lib/src/data/repositories_impl/auth_repository_impl.dart

@@ -10,7 +10,9 @@ import '../../domain/ui_entities/auth_mode.dart';
 import '../../domain/repositories/auth_repository_interface.dart';
 
 /// Implementation of [AuthRepositoryInterface].
-class AuthRepositoryImpl implements AuthRepositoryInterface {
+class AuthRepositoryImpl
+    with DataErrorHandler
+    implements AuthRepositoryInterface {
   AuthRepositoryImpl({
     required this.firebaseAuth,
     required this.dataConnect,
@@ -112,31 +114,35 @@ class AuthRepositoryImpl implements AuthRepositoryInterface {
     }
 
     final QueryResult<GetUserByIdData, GetUserByIdVariables> response =
-        await dataConnect.getUserById(
-          id: firebaseUser.uid,
-        ).execute();
+        await executeProtected(() => dataConnect
+            .getUserById(
+              id: firebaseUser.uid,
+            )
+            .execute());
     final GetUserByIdUser? user = response.data.user;
 
     GetStaffByUserIdStaffs? staffRecord;
 
     if (mode == AuthMode.signup) {
       if (user == null) {
-        await dataConnect
+        await executeProtected(() => dataConnect
             .createUser(
               id: firebaseUser.uid,
               role: UserBaseRole.USER,
             )
             .userRole('STAFF')
-            .execute();
+            .execute());
       } else {
         if (user.userRole != 'STAFF') {
           await firebaseAuth.signOut();
           throw Exception('User is not authorized for this app.');
         }
         final QueryResult<GetStaffByUserIdData, GetStaffByUserIdVariables>
-            staffResponse = await dataConnect.getStaffByUserId(
-              userId: firebaseUser.uid,
-            ).execute();
+            staffResponse = await executeProtected(() => dataConnect
+                .getStaffByUserId(
+                  userId: firebaseUser.uid,
+                )
+                .execute());
         if (staffResponse.data.staffs.isNotEmpty) {
           await firebaseAuth.signOut();
           throw Exception(
@@ -155,9 +161,11 @@ class AuthRepositoryImpl implements AuthRepositoryInterface {
       }
 
       final QueryResult<GetStaffByUserIdData, GetStaffByUserIdVariables>
-          staffResponse = await dataConnect.getStaffByUserId(
-            userId: firebaseUser.uid,
-          ).execute();
+          staffResponse = await executeProtected(() => dataConnect
+              .getStaffByUserId(
+                userId: firebaseUser.uid,
+              )
+              .execute());
       if (staffResponse.data.staffs.isEmpty) {
         await firebaseAuth.signOut();
         throw Exception(