feat(profile-repository): Refactor ProfileRepositoryImpl to utilize DataConnectService and simplify authentication handling

apps/mobile/packages/features/staff/profile/lib/src/data/repositories/profile_repository_impl.dart

@@ -1,4 +1,3 @@
-import 'package:firebase_auth/firebase_auth.dart';
 import 'package:krow_data_connect/krow_data_connect.dart';
 import 'package:krow_domain/krow_domain.dart';
 
@@ -15,38 +14,23 @@ import '../../domain/repositories/profile_repository.dart';
 /// Currently uses [ProfileRepositoryMock] from data_connect.
 /// When Firebase Data Connect is ready, this will be swapped with a real implementation.
 class ProfileRepositoryImpl
-    with DataErrorHandler
     implements ProfileRepositoryInterface {
   /// Creates a [ProfileRepositoryImpl].
-  ///
-  /// Requires a [ExampleConnector] from the data_connect package and [FirebaseAuth].
-  const ProfileRepositoryImpl({
-    required this.connector,
-    required this.firebaseAuth,
-  });
+  ProfileRepositoryImpl() : _service = DataConnectService.instance;
 
-  /// The Data Connect connector used for data operations.
-  final ExampleConnector connector;
-
-  /// The Firebase Auth instance.
-  final FirebaseAuth firebaseAuth;
+  final DataConnectService _service;
 
   @override
   Future<Staff> getStaffProfile() async {
-    return executeProtected(() async {
-      final user = firebaseAuth.currentUser;
-      if (user == null) {
-        throw NotAuthenticatedException(
-            technicalMessage: 'User not authenticated');
-      }
-
-      final response = await connector.getStaffByUserId(userId: user.uid).execute();
+    return _service.run(() async {
+      final staffId = await _service.getStaffId();
+      final response = await _service.connector.getStaffById(id: staffId).execute();
       
-      if (response.data.staffs.isEmpty) {
+      if (response.data.staff == null) {
         throw const ServerException(technicalMessage: 'Staff not found');
       }
 
-      final GetStaffByUserIdStaffs rawStaff = response.data.staffs.first;
+      final GetStaffByIdStaff rawStaff = response.data.staff!;
 
       // Map the raw data connect object to the Domain Entity
       return Staff(
@@ -71,7 +55,8 @@ class ProfileRepositoryImpl
   @override
   Future<void> signOut() async {
     try {
-      await firebaseAuth.signOut();
+      await _service.auth.signOut();
+      _service.clearCache();
     } catch (e) {
       throw Exception('Error signing out: ${e.toString()}');
     }

apps/mobile/packages/features/staff/profile/lib/src/staff_profile_module.dart

@@ -1,8 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_modular/flutter_modular.dart';
 import 'package:krow_core/core.dart';
-import 'package:krow_data_connect/krow_data_connect.dart';
-import 'package:firebase_auth/firebase_auth.dart';
 
 import 'data/repositories/profile_repository_impl.dart';
 import 'domain/repositories/profile_repository.dart';
@@ -25,10 +23,7 @@ class StaffProfileModule extends Module {
   void binds(Injector i) {
     // Repository implementation - delegates to data_connect
     i.addLazySingleton<ProfileRepositoryInterface>(
-      () => ProfileRepositoryImpl(
-        connector: ExampleConnector.instance,
-        firebaseAuth: FirebaseAuth.instance,
-      ),
+      ProfileRepositoryImpl.new,
     );
 
     // Use cases - depend on repository interface