feat: Add DateTimeUtils for converting UTC to device local time and update imports

apps/mobile/packages/core/lib/core.dart

@@ -2,3 +2,4 @@ library core;
 
 export 'src/domain/arguments/usecase_argument.dart';
 export 'src/domain/usecases/usecase.dart';
+export 'src/utils/date_time_utils.dart';

apps/mobile/packages/core/lib/src/utils/date_time_utils.dart

@@ -0,0 +1,7 @@
+
+class DateTimeUtils {
+  /// Converts a [DateTime] (assumed UTC if not specified) to the device's local time.
+  static DateTime toDeviceTime(DateTime date) {
+    return date.toLocal();
+  }
+}

apps/mobile/packages/features/staff/shifts/lib/src/data/repositories_impl/shifts_repository_impl.dart

@@ -4,6 +4,7 @@ import 'package:krow_domain/krow_domain.dart';
 import 'package:intl/intl.dart';
 import 'package:firebase_auth/firebase_auth.dart';
 import 'package:firebase_data_connect/firebase_data_connect.dart';
+import 'package:krow_core/core.dart';
 import '../../domain/repositories/shifts_repository_interface.dart';
 
 class ShiftsRepositoryImpl implements ShiftsRepositoryInterface {
@@ -51,15 +52,27 @@ class ShiftsRepositoryImpl implements ShiftsRepositoryInterface {
   
   DateTime? _toDateTime(dynamic t) {
     if (t == null) return null;
-    try {
-      return DateTime.tryParse(t.toJson() as String);
-    } catch (_) {
+    DateTime? dt;
+    if (t is Timestamp) {
+      dt = t.toDateTime();
+    } else if (t is String) {
+      dt = DateTime.tryParse(t);
+    } else {
       try {
-         return DateTime.tryParse(t.toString());
-      } catch (e) {
-         return null;
+        dt = DateTime.tryParse(t.toJson() as String);
+      } catch (_) {
+        try {
+          dt = DateTime.tryParse(t.toString());
+        } catch (e) {
+          dt = null;
+        }
       }
     }
+
+    if (dt != null) {
+      return DateTimeUtils.toDeviceTime(dt);
+    }
+    return null;
   }
 
   @override

apps/mobile/packages/features/staff/shifts/lib/src/presentation/widgets/tabs/find_shifts_tab.dart

@@ -1,8 +1,7 @@
-import 'package:flutter/material.dart';
-import 'package:flutter_modular/flutter_modular.dart';
 import 'package:design_system/design_system.dart';
+import 'package:flutter/material.dart';
 import 'package:krow_domain/krow_domain.dart';
-import '../../navigation/shifts_navigator.dart';
+
 import '../../styles/shifts_styles.dart';
 import '../my_shift_card.dart';
 import '../shared/empty_state_view.dart';