auto-claude: subtask-6-1 - Run flutter analyze to ensure no errors or warnings

Fixed all 39 analyzer issues:
- Removed unused import (animation_system.dart in collapsible_routes_sidebar.dart)
- Removed unused element (_buildActionButton in dark_mode_map.dart)
- Fixed unnecessary non-null assertions on AppLocalizations.of(context)
- Removed unnecessary type checks in providers.dart
- Used super parameters for key in navigation_tc_dialog.dart and status_colors.dart
- Replaced print statements with debugPrint in providers.dart and logging_interceptor.dart

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

lib/components/route_list_item.dart

@@ -80,7 +80,7 @@ class _RouteListItemState extends State<RouteListItem>
   Widget build(BuildContext context) {
     final isDark = Theme.of(context).brightness == Brightness.dark;
     final statusColor = _getStatusColor(widget.route);
-    final l10n = AppLocalizations.of(context)!;
+    final l10n = AppLocalizations.of(context);
 
     // Collapsed view: Show only the badge
     if (widget.isCollapsed) {