Fix calendar navigation, task deletion, and language defaults

- Add date parameter support to DailyAgendaPage for calendar navigation
- Add popup menu to task tile with delete and reschedule options
- Set default locale to English when none is saved
- Update API base URL comment for desktop vs Android

lib/features/settings/presentation/pages/settings_page.dart

@@ -27,11 +27,7 @@ class SettingsPage extends StatelessWidget {
           ListTile(
             leading: const Icon(Icons.language),
             title: Text(l10n.language),
-            subtitle: Text(
-              settingsVm.locale != null
-                  ? settingsVm.getLanguageName(settingsVm.locale!)
-                  : l10n.systemDefault,
-            ),
+            subtitle: Text(settingsVm.getLanguageName(settingsVm.locale!)),
             trailing: const Icon(Icons.chevron_right),
             onTap: () => _showLanguageDialog(context, settingsVm, l10n),
           ),
@@ -107,12 +103,12 @@ class _LanguageDialog extends StatefulWidget {
 }
 
 class _LanguageDialogState extends State<_LanguageDialog> {
-  late Locale? _selectedLocale;
+  late String _selectedLanguage;
 
   @override
   void initState() {
     super.initState();
-    _selectedLocale = widget.vm.locale;
+    _selectedLanguage = widget.vm.locale!.languageCode;
   }
 
   @override
@@ -121,27 +117,27 @@ class _LanguageDialogState extends State<_LanguageDialog> {
       title: Text(widget.l10n.language),
       content: Column(
         mainAxisSize: MainAxisSize.min,
-        children: SettingsViewModel.supportedLocales.map((locale) {
-          return ListTile(
-            title: Text(widget.vm.getLanguageName(locale)),
-            leading: Radio<Locale>(
-              value: locale,
-              groupValue: _selectedLocale,
-              onChanged: (value) {
-                setState(() => _selectedLocale = value);
-                if (value != null) {
-                  widget.vm.setLocale(value);
+        children: [
+          ...SettingsViewModel.supportedLocales.map((locale) {
+            return ListTile(
+              title: Text(widget.vm.getLanguageName(locale)),
+              leading: Radio<String>(
+                value: locale.languageCode,
+                groupValue: _selectedLanguage,
+                onChanged: (value) {
+                  setState(() => _selectedLanguage = value!);
+                  widget.vm.setLocale(locale);
                   Navigator.pop(context);
-                }
+                },
+              ),
+              onTap: () {
+                setState(() => _selectedLanguage = locale.languageCode);
+                widget.vm.setLocale(locale);
+                Navigator.pop(context);
               },
-            ),
-            onTap: () {
-              setState(() => _selectedLocale = locale);
-              widget.vm.setLocale(locale);
-              Navigator.pop(context);
-            },
-          );
-        }).toList(),
+            );
+          }),
+        ],
       ),
       actions: [
         TextButton(

lib/features/settings/presentation/viewmodels/settings_viewmodel.dart

@@ -26,7 +26,7 @@ class SettingsViewModel extends ChangeNotifier {
   ];
 
   void _loadSettings() {
-    _locale = dataSource.getLocale();
+    _locale = dataSource.getLocale() ?? const Locale('en');
     _themeMode = dataSource.getThemeMode();
     logger.info('Settings loaded: locale=$_locale, themeMode=$_themeMode');
   }

lib/features/tasks/data/datasources/task_remote_datasource.dart

@@ -21,7 +21,8 @@ class TaskRemoteDataSourceImpl implements TaskRemoteDataSource {
   final AppLogger logger;
   final http.Client _client;
 
-  static const String _baseUrl = 'http://10.0.2.2:8000';
+  // Use 10.0.2.2 for Android emulator, localhost for desktop/web
+  static const String _baseUrl = 'http://localhost:8000';
 
   TaskRemoteDataSourceImpl({
     required this.logger,

lib/features/tasks/presentation/pages/daily_agenda_page.dart

@@ -10,12 +10,25 @@ import '../widgets/task_tile.dart';
 import '../widgets/filter_chips.dart';
 
 class DailyAgendaPage extends StatelessWidget {
-  const DailyAgendaPage({super.key});
+  final String? initialDate;
+
+  const DailyAgendaPage({super.key, this.initialDate});
 
   @override
   Widget build(BuildContext context) {
     return ChangeNotifierProvider(
-      create: (_) => getIt<DailyTasksViewModel>()..loadTasks(),
+      create: (_) {
+        final vm = getIt<DailyTasksViewModel>();
+        if (initialDate != null) {
+          final date = DateTime.tryParse(initialDate!);
+          if (date != null) {
+            vm.setSelectedDate(date);
+            return vm;
+          }
+        }
+        vm.loadTasks();
+        return vm;
+      },
       child: const _DailyAgendaView(),
     );
   }

lib/features/tasks/presentation/widgets/task_tile.dart

@@ -118,10 +118,55 @@ class TaskTile extends StatelessWidget {
                     ],
                   ),
                 ),
-                IconButton(
-                  icon: const Icon(Icons.schedule),
-                  onPressed: onReschedule,
-                  tooltip: l10n.rescheduleToTomorrow,
+                PopupMenuButton<String>(
+                  onSelected: (value) async {
+                    if (value == 'reschedule') {
+                      onReschedule();
+                    } else if (value == 'delete') {
+                      final confirm = await showDialog<bool>(
+                        context: context,
+                        builder: (context) => AlertDialog(
+                          title: Text(l10n.deleteTask),
+                          content: Text(l10n.deleteTaskConfirm),
+                          actions: [
+                            TextButton(
+                              onPressed: () => Navigator.pop(context, false),
+                              child: Text(l10n.cancel),
+                            ),
+                            TextButton(
+                              onPressed: () => Navigator.pop(context, true),
+                              child: Text(l10n.delete),
+                            ),
+                          ],
+                        ),
+                      );
+                      if (confirm == true) {
+                        onDelete();
+                      }
+                    }
+                  },
+                  itemBuilder: (context) => [
+                    PopupMenuItem(
+                      value: 'reschedule',
+                      child: Row(
+                        children: [
+                          const Icon(Icons.schedule),
+                          const SizedBox(width: 8),
+                          Text(l10n.rescheduleToTomorrow),
+                        ],
+                      ),
+                    ),
+                    PopupMenuItem(
+                      value: 'delete',
+                      child: Row(
+                        children: [
+                          Icon(Icons.delete, color: Theme.of(context).colorScheme.error),
+                          const SizedBox(width: 8),
+                          Text(l10n.delete, style: TextStyle(color: Theme.of(context).colorScheme.error)),
+                        ],
+                      ),
+                    ),
+                  ],
                 ),
               ],
             ),

lib/routing/app_router.dart

@@ -12,7 +12,10 @@ class AppRouter {
       GoRoute(
         path: '/',
         name: 'daily',
-        builder: (context, state) => const DailyAgendaPage(),
+        builder: (context, state) {
+          final dateStr = state.uri.queryParameters['date'];
+          return DailyAgendaPage(initialDate: dateStr);
+        },
       ),
       GoRoute(
         path: '/calendar',