fixing a ton of sloppy mess...

walkguide-mobile/walkguide_app/lib/features/notifications/notification_screen.dart

@@ -4,10 +4,8 @@
 import 'dart:async';
 import 'package:dio/dio.dart';
 import 'package:flutter/material.dart';
-import 'package:go_router/go_router.dart';
 import 'package:intl/intl.dart';
 import '../../app/injection_container.dart';
-import '../../core/constants/app_constants.dart';
 import '../../core/network/api_client.dart';
 import '../../core/services/tts_service.dart';
 import '../../core/theme/app_colors.dart';
@@ -254,13 +252,13 @@ class _NotifCard extends StatelessWidget {
         borderRadius: BorderRadius.circular(14),
         border: Border.all(
           color: unread
-              ? AppColors.primary.withOpacity(0.3)
+              ? AppColors.primary.withValues(alpha: 0.3)
               : const Color(0xFFE2E8F0),
           width: unread ? 1.5 : 1,
         ),
         boxShadow: [
           BoxShadow(
-            color: Colors.black.withOpacity(0.04),
+            color: Colors.black.withValues(alpha: 0.04),
             blurRadius: 8,
             offset: const Offset(0, 2),
           ),
@@ -279,8 +277,8 @@ class _NotifCard extends StatelessWidget {
                   height: 36,
                   decoration: BoxDecoration(
                     color: isVoice
-                        ? AppColors.success.withOpacity(0.12)
-                        : AppColors.primary.withOpacity(0.12),
+                        ? AppColors.success.withValues(alpha: 0.12)
+                        : AppColors.primary.withValues(alpha: 0.12),
                     borderRadius: BorderRadius.circular(10),
                   ),
                   child: Icon(