сборка: APK (Android) + Linux Desktop

- Исправлены ошибки Flutter анализа (withOpacity, pbkdf2, импорты)
- Упрощён pubspec.yaml (только нужные зависимости)
- Android APK собран: build/app/outputs/flutter-apk/app-release.apk (22MB)
- Linux Desktop собран: build/linux/x64/release/bundle/jam_client

Для Windows: кросс-компиляция невозможна с Linux.
Нужен Windows хост для flutter build windows.

client/lib/screens/chat_screen.dart

@@ -8,7 +8,6 @@ import '../services/api_service.dart';
 import '../services/theme_service.dart';
 import '../models/message.dart';
 import '../models/channel.dart';
-import '../models/guild.dart';
 import '../widgets/message_bubble.dart';
 import '../widgets/chat_input.dart';
 
@@ -28,7 +27,6 @@ class _ChatScreenState extends State<ChatScreen> {
   bool _atBottom = true;
 
   late Channel _channel;
-  late Guild _guild;
 
   @override
   void didChangeDependencies() {
@@ -36,7 +34,6 @@ class _ChatScreenState extends State<ChatScreen> {
     final args = ModalRoute.of(context)?.settings.arguments as Map?;
     if (args != null) {
       _channel = args['channel'] as Channel;
-      _guild = args['guild'] as Guild;
     }
   }
 
@@ -201,7 +198,7 @@ class _ChatScreenState extends State<ChatScreen> {
           Icon(
             _channel.isText ? Icons.tag : Icons.volume_up,
             size: 48,
-            color: ThemeService.textMuted.withValues(alpha: 0.5),
+            color: ThemeService.textMuted.withOpacity(0.5),
           ),
           const SizedBox(height: 12),
           Text(
@@ -226,7 +223,7 @@ class _ChatScreenState extends State<ChatScreen> {
           Text(
             'No messages yet. Start the conversation!',
             style: TextStyle(
-              color: ThemeService.textMuted.withValues(alpha: 0.8),
+              color: ThemeService.textMuted.withOpacity(0.8),
               fontSize: 14,
             ),
           ),

client/lib/screens/home_screen.dart

@@ -207,7 +207,7 @@ class _HomeScreenState extends State<HomeScreen> {
             color: ThemeService.surfacePrimary,
             borderRadius: BorderRadius.circular(24),
             border: Border.all(
-              color: ThemeService.success.withValues(alpha: 0.5),
+              color: ThemeService.success.withOpacity(0.5),
               width: 2,
             ),
           ),

client/lib/screens/login_screen.dart

@@ -120,10 +120,10 @@ class _LoginScreenState extends State<LoginScreen> {
                 Container(
                   padding: const EdgeInsets.all(12),
                   decoration: BoxDecoration(
-                    color: ThemeService.danger.withValues(alpha: 0.1),
+                    color: ThemeService.danger.withOpacity(0.1),
                     borderRadius: BorderRadius.circular(8),
                     border: Border.all(
-                        color: ThemeService.danger.withValues(alpha: 0.3)),
+                        color: ThemeService.danger.withOpacity(0.3)),
                   ),
                   child: Row(
                     children: [

client/lib/screens/splash_screen.dart

@@ -62,7 +62,7 @@ class _SplashScreenState extends State<SplashScreen>
                       borderRadius: BorderRadius.circular(24),
                       boxShadow: [
                         BoxShadow(
-                          color: ThemeService.primary.withValues(alpha: 0.4),
+                          color: ThemeService.primary.withOpacity(0.4),
                           blurRadius: 30,
                           spreadRadius: 5,
                         ),
@@ -94,7 +94,7 @@ class _SplashScreenState extends State<SplashScreen>
                   Text(
                     'Lightweight · Decentralized · Secure',
                     style: TextStyle(
-                      color: ThemeService.textSecondary.withValues(alpha: 0.7),
+                      color: ThemeService.textSecondary.withOpacity(0.7),
                       fontSize: 14,
                       letterSpacing: 0.5,
                     ),