feat: implement self-signed certificate support in API and UI

- Added support for self-signed TLS certificates in the ApiService, allowing configuration based on server settings.
- Introduced a toggle in the ServerConnectionPage to enable or disable trusting self-signed certificates.
- Updated localization files to include new strings for self-signed certificate settings in multiple languages.
- Enhanced the OptimizedStorageService to manage trusted servers based on user preferences for self-signed certificates.
- Improved error handling and logging throughout the affected services to ensure clarity and maintainability.

lib/features/auth/views/server_connection_page.dart

@@ -36,6 +36,7 @@ class _ServerConnectionPageState extends ConsumerState<ServerConnectionPage> {
   String? _connectionError;
   bool _isConnecting = false;
   bool _showAdvancedSettings = false;
+  bool _allowSelfSignedCertificates = false;
 
   @override
   void initState() {
@@ -45,9 +46,11 @@ class _ServerConnectionPageState extends ConsumerState<ServerConnectionPage> {
 
   Future<void> _prefillFromState() async {
     final activeServer = await ref.read(activeServerProvider.future);
-    if (activeServer != null) {
+    if (!mounted || activeServer == null) return;
+    setState(() {
       _urlController.text = activeServer.url;
-    }
+      _allowSelfSignedCertificates = activeServer.allowSelfSignedCertificates;
+    });
   }
 
   @override
@@ -75,6 +78,7 @@ class _ServerConnectionPageState extends ConsumerState<ServerConnectionPage> {
         url: url,
         customHeaders: Map<String, String>.from(_customHeaders),
         isActive: true,
+        allowSelfSignedCertificates: _allowSelfSignedCertificates,
       );
 
       final api = ApiService(serverConfig: tempConfig);
@@ -536,6 +540,69 @@ class _ServerConnectionPageState extends ConsumerState<ServerConnectionPage> {
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
+          Container(
+            width: double.infinity,
+            padding: const EdgeInsets.all(Spacing.md),
+            margin: const EdgeInsets.only(bottom: Spacing.md),
+            decoration: BoxDecoration(
+              color: context.conduitTheme.surfaceContainer.withValues(
+                alpha: 0.3,
+              ),
+              borderRadius: BorderRadius.circular(AppBorderRadius.small),
+              border: Border.all(
+                color: context.conduitTheme.dividerColor.withValues(alpha: 0.4),
+                width: BorderWidth.thin,
+              ),
+            ),
+            child: Row(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Icon(
+                  Platform.isIOS
+                      ? CupertinoIcons.lock_shield
+                      : Icons.verified_user,
+                  color: context.conduitTheme.iconSecondary,
+                  size: IconSize.small,
+                ),
+                const SizedBox(width: Spacing.sm),
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        AppLocalizations.of(
+                          context,
+                        )!.allowSelfSignedCertificates,
+                        style: context.conduitTheme.bodySmall?.copyWith(
+                          fontWeight: FontWeight.w600,
+                          color: context.conduitTheme.textPrimary,
+                        ),
+                      ),
+                      const SizedBox(height: Spacing.xs),
+                      Text(
+                        AppLocalizations.of(
+                          context,
+                        )!.allowSelfSignedCertificatesDescription,
+                        style: context.conduitTheme.bodySmall?.copyWith(
+                          color: context.conduitTheme.textSecondary,
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+                const SizedBox(width: Spacing.sm),
+                Switch.adaptive(
+                  value: _allowSelfSignedCertificates,
+                  onChanged: (value) {
+                    setState(() {
+                      _allowSelfSignedCertificates = value;
+                    });
+                  },
+                  activeTrackColor: context.conduitTheme.buttonPrimary,
+                ),
+              ],
+            ),
+          ),
           Row(
             mainAxisAlignment: MainAxisAlignment.spaceBetween,
             children: [

lib/features/chat/services/voice_call_notification_service.dart

@@ -17,8 +17,7 @@ class VoiceCallNotificationService {
   // Notification IDs and channels
   static const String _channelId = 'voice_call_channel';
   static const String _channelName = 'Voice Call';
-  static const String _channelDescription =
-      'Ongoing voice call notifications';
+  static const String _channelDescription = 'Ongoing voice call notifications';
   static const int _notificationId = 2001;
 
   // Action IDs
@@ -32,7 +31,9 @@ class VoiceCallNotificationService {
   Future<void> initialize() async {
     if (_initialized) return;
 
-    const androidSettings = AndroidInitializationSettings('@mipmap/ic_launcher');
+    const androidSettings = AndroidInitializationSettings(
+      '@mipmap/ic_launcher',
+    );
     const iosSettings = DarwinInitializationSettings(
       requestAlertPermission: false,
       requestBadgePermission: false,
@@ -72,7 +73,8 @@ class VoiceCallNotificationService {
 
     await _notifications
         .resolvePlatformSpecificImplementation<
-            AndroidFlutterLocalNotificationsPlugin>()
+          AndroidFlutterLocalNotificationsPlugin
+        >()
         ?.createNotificationChannel(androidChannel);
   }
 
@@ -190,8 +192,10 @@ class VoiceCallNotificationService {
   /// Check if notifications are enabled
   Future<bool> areNotificationsEnabled() async {
     if (Platform.isAndroid) {
-      final androidImpl = _notifications.resolvePlatformSpecificImplementation<
-          AndroidFlutterLocalNotificationsPlugin>();
+      final androidImpl = _notifications
+          .resolvePlatformSpecificImplementation<
+            AndroidFlutterLocalNotificationsPlugin
+          >();
       return await androidImpl?.areNotificationsEnabled() ?? false;
     } else if (Platform.isIOS) {
       // iOS doesn't have a direct check, assume enabled if initialized
@@ -203,13 +207,17 @@ class VoiceCallNotificationService {
   /// Request notification permissions
   Future<bool> requestPermissions() async {
     if (Platform.isAndroid) {
-      final androidImpl = _notifications.resolvePlatformSpecificImplementation<
-          AndroidFlutterLocalNotificationsPlugin>();
+      final androidImpl = _notifications
+          .resolvePlatformSpecificImplementation<
+            AndroidFlutterLocalNotificationsPlugin
+          >();
       final granted = await androidImpl?.requestNotificationsPermission();
       return granted ?? false;
     } else if (Platform.isIOS) {
       final iosImpl = _notifications
-          .resolvePlatformSpecificImplementation<IOSFlutterLocalNotificationsPlugin>();
+          .resolvePlatformSpecificImplementation<
+            IOSFlutterLocalNotificationsPlugin
+          >();
       final granted = await iosImpl?.requestPermissions(
         alert: true,
         badge: false,

lib/features/chat/views/voice_call_page.dart

@@ -148,9 +148,8 @@ class _VoiceCallPageState extends ConsumerState<VoiceCallPage>
           icon: const Icon(CupertinoIcons.xmark),
           onPressed: () async {
             await _service?.stopCall();
-            if (mounted) {
-              Navigator.of(context).pop();
-            }
+            if (!context.mounted) return;
+            Navigator.of(context).pop();
           },
         ),
       ),

lib/features/chat/widgets/modern_chat_input.dart

@@ -1480,9 +1480,7 @@ class _ModernChatInputState extends ConsumerState<ModernChatInput>
                 ),
                 child: Center(
                   child: Icon(
-                    Platform.isIOS
-                        ? CupertinoIcons.waveform
-                        : Icons.graphic_eq,
+                    Platform.isIOS ? CupertinoIcons.waveform : Icons.graphic_eq,
                     size: IconSize.large,
                     color: enabledVoiceCall
                         ? context.conduitTheme.buttonPrimaryText