feat(shifts): implement submit for approval functionality

- Added `submitForApproval` method to `ShiftsRepositoryInterface` and its implementation in `ShiftsRepositoryImpl`.
- Created `SubmitForApprovalUseCase` to handle the submission logic.
- Updated `ShiftsBloc` to handle `SubmitForApprovalEvent` and manage submission state.
- Enhanced `HistoryShiftsTab` and `MyShiftsTab` to support submission actions and display appropriate UI feedback.
- Refactored date utilities for better calendar management and filtering of past shifts.
- Improved UI components for better spacing and alignment.
- Localized success messages for shift submission actions.

apps/mobile/apps/client/lib/src/widgets/session_listener.dart

@@ -1,5 +1,6 @@
 import 'dart:async';
 
+import 'package:core_localization/core_localization.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_modular/flutter_modular.dart';
 import 'package:krow_core/core.dart';
@@ -84,7 +85,7 @@ class _SessionListenerState extends State<SessionListener> {
         if (!_isInitialState) {
           debugPrint('[SessionListener] Session error: ${state.errorMessage}');
           _showSessionErrorDialog(
-            state.errorMessage ?? 'Session error occurred',
+            state.errorMessage ?? t.session.error_title,
           );
         } else {
           _isInitialState = false;
@@ -101,22 +102,21 @@ class _SessionListenerState extends State<SessionListener> {
 
   /// Shows a dialog when the session expires.
   void _showSessionExpiredDialog() {
+    final Translations translations = t;
     showDialog<void>(
       context: context,
       barrierDismissible: false,
-      builder: (BuildContext context) {
+      builder: (BuildContext dialogContext) {
         return AlertDialog(
-          title: const Text('Session Expired'),
-          content: const Text(
-            'Your session has expired. Please log in again to continue.',
-          ),
+          title: Text(translations.session.expired_title),
+          content: Text(translations.session.expired_message),
           actions: <Widget>[
             TextButton(
               onPressed: () {
-                Modular.to.popSafe();
+                Navigator.of(dialogContext).pop();
                 _proceedToLogin();
               },
-              child: const Text('Log In'),
+              child: Text(translations.session.log_in),
             ),
           ],
         );
@@ -126,27 +126,28 @@ class _SessionListenerState extends State<SessionListener> {
 
   /// Shows a dialog when a session error occurs, with retry option.
   void _showSessionErrorDialog(String errorMessage) {
+    final Translations translations = t;
     showDialog<void>(
       context: context,
       barrierDismissible: false,
-      builder: (BuildContext context) {
+      builder: (BuildContext dialogContext) {
         return AlertDialog(
-          title: const Text('Session Error'),
+          title: Text(translations.session.error_title),
           content: Text(errorMessage),
           actions: <Widget>[
             TextButton(
               onPressed: () {
                 // User can retry by dismissing and continuing
-                Modular.to.popSafe();
+                Navigator.of(dialogContext).pop();
               },
-              child: const Text('Continue'),
+              child: Text(translations.common.continue_text),
             ),
             TextButton(
               onPressed: () {
-                Modular.to.popSafe();
+                Navigator.of(dialogContext).pop();
                 _proceedToLogin();
               },
-              child: const Text('Log Out'),
+              child: Text(translations.session.log_out),
             ),
           ],
         );