fix: resolve payments compilation error and remove redundant datasource layer

apps/mobile/packages/features/staff/payments/lib/src/data/repositories/payments_repository_impl.dart

@@ -2,41 +2,75 @@ import 'package:firebase_data_connect/firebase_data_connect.dart';
 import 'package:krow_data_connect/krow_data_connect.dart' as dc;
 import 'package:krow_data_connect/src/session/staff_session_store.dart';
 import 'package:krow_domain/krow_domain.dart';
+import 'package:firebase_auth/firebase_auth.dart';
 import '../../domain/repositories/payments_repository.dart';
 
 class PaymentsRepositoryImpl implements PaymentsRepository {
   final dc.ExampleConnector _dataConnect;
+  final FirebaseAuth _auth = FirebaseAuth.instance;
 
   PaymentsRepositoryImpl() : _dataConnect = dc.ExampleConnector.instance;
 
+  String? _cachedStaffId;
+
+  Future<String> _getStaffId() async {
+    // 1. Check Session Store
+    final StaffSession? session = StaffSessionStore.instance.session;
+    if (session?.staff?.id != null) {
+      return session!.staff!.id;
+    }
+
+    // 2. Check Cache
+    if (_cachedStaffId != null) return _cachedStaffId!;
+
+    // 3. Fetch from Data Connect using Firebase UID
+    final user = _auth.currentUser;
+    if (user == null) {
+      throw Exception('User is not authenticated');
+    }
+
+    try {
+      final response = await _dataConnect.getStaffByUserId(userId: user.uid).execute();
+      if (response.data.staffs.isNotEmpty) {
+        _cachedStaffId = response.data.staffs.first.id;
+        return _cachedStaffId!;
+      }
+    } catch (e) {
+      // Log or handle error
+    }
+
+    // 4. Fallback
+    return user.uid;
+  }
+
   /// Helper to convert Data Connect Timestamp to DateTime
   DateTime? _toDateTime(dynamic t) {
     if (t == null) return null;
+    if (t is DateTime) return t;
+    if (t is String) return DateTime.tryParse(t);
+
     try {
-      // Attempt to deserialize via standard methods
-      return DateTime.tryParse(t.toJson() as String);
-    } catch (_) {
-      try {
-         return DateTime.tryParse(t.toString());
-      } catch (e) {
-         return null;
+      if (t is Timestamp) {
+        return t.toDateTime();
       }
-    }
+    } catch (_) {}
+
+    try {
+      if (t.runtimeType.toString().contains('Timestamp')) {
+        return (t as dynamic).toDate();
+      }
+    } catch (_) {}
+
+    try {
+      return DateTime.tryParse(t.toString());
+    } catch (_) {}
+
+    return null;
   }
 
   @override
   Future<PaymentSummary> getPaymentSummary() async {
-    final StaffSession? session = StaffSessionStore.instance.session;
-    if (session?.staff?.id == null) {
-      return const PaymentSummary(
-        weeklyEarnings: 0,
-        monthlyEarnings: 0,
-        pendingEarnings: 0,
-        totalEarnings: 0,
-      );
-    }
-    
-    final String currentStaffId = session!.staff!.id;
+    final String currentStaffId = await _getStaffId();
 
     // Fetch recent payments with a limit
     // Note: limit is chained on the query builder
@@ -82,10 +116,7 @@ class PaymentsRepositoryImpl implements PaymentsRepository {
 
   @override
   Future<List<StaffPayment>> getPaymentHistory(String period) async {
-    final StaffSession? session = StaffSessionStore.instance.session;
-    if (session?.staff?.id == null) return <StaffPayment>[];
-    
-    final String currentStaffId = session!.staff!.id;
+    final String currentStaffId = await _getStaffId();
 
     try {
       final QueryResult<dc.ListRecentPaymentsByStaffIdData, dc.ListRecentPaymentsByStaffIdVariables> response = 

apps/mobile/packages/features/staff/payments/lib/src/presentation/pages/payments_page.dart

@@ -210,7 +210,7 @@ class _PaymentsPageState extends State<PaymentsPage> {
                     ],
                   ),
 
-                  const SizedBox(height: 32),
+                  const SizedBox(height: 100),
                 ],
               ),
             ),