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/utils/logging_interceptor.dart

@@ -1,26 +1,27 @@
+import 'package:flutter/foundation.dart';
 import 'package:http_interceptor/http_interceptor.dart';
 
 class LoggingInterceptor implements InterceptorContract {
   @override
   Future<BaseRequest> interceptRequest({required BaseRequest request}) async {
-    print('━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━');
-    print('📤 REQUEST: ${request.method} ${request.url}');
-    print('Headers: ${request.headers}');
+    debugPrint('----------------------------------------------------');
+    debugPrint('REQUEST: ${request.method} ${request.url}');
+    debugPrint('Headers: ${request.headers}');
     if (request is Request) {
-      print('Body: ${request.body}');
+      debugPrint('Body: ${request.body}');
     }
-    print('━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━');
+    debugPrint('----------------------------------------------------');
     return request;
   }
 
   @override
   Future<BaseResponse> interceptResponse({required BaseResponse response}) async {
-    print('━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━');
-    print('📥 RESPONSE: ${response.statusCode} ${response.request?.url}');
+    debugPrint('----------------------------------------------------');
+    debugPrint('RESPONSE: ${response.statusCode} ${response.request?.url}');
     if (response is Response) {
-      print('Body: ${response.body}');
+      debugPrint('Body: ${response.body}');
     }
-    print('━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━');
+    debugPrint('----------------------------------------------------');
     return response;
   }