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_en.arb

@@ -146,5 +146,8 @@
     }
   },
   "serverError": "Server error - Please contact support",
-  "retake": "Retake"
+  "retake": "Retake",
+  "completingDelivery": "Completing delivery...",
+  "markingAsUncompleted": "Marking as uncompleted...",
+  "deliveryMarkedUncompleted": "Delivery marked as uncompleted"
 }