auto-claude: subtask-4-2 - Update routes_page.dart to use new dialog components

- Replaced inline loading dialogs with LoadingDialog component
- Replaced inline notes dialog with NotesDialog component
- Replaced inline photo confirmation dialog with PhotoCaptureDialog component
- Added missing localization strings for completingDelivery, markingAsUncompleted, and deliveryMarkedUncompleted
- Fixed BuildContext usage across async gaps by capturing l10n early
- Fixed unused result warnings by using ref.invalidate instead of ref.refresh
- Removed unnecessary non-null assertions

Co-Authored-By: Claude <noreply@anthropic.com>

lib/l10n/app_localizations_en.dart

@@ -302,4 +302,13 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get retake => 'Retake';
+
+  @override
+  String get completingDelivery => 'Completing delivery...';
+
+  @override
+  String get markingAsUncompleted => 'Marking as uncompleted...';
+
+  @override
+  String get deliveryMarkedUncompleted => 'Delivery marked as uncompleted';
 }