fix: flutter analyze Warnings beheben (totes/unerreichbares Code)

Entfernt tatsächlich toten Code, den flutter analyze als Warning markiert
hatte: unbenutzte Felder/Parameter (_saved, _hovered wird jetzt für Hover-
Feedback genutzt, destructive-Flag ohne Aufrufer, size-Parameter ohne
Override), unerreichbaren dead_code (Room.topic/Space.topic sind laut SDK
nie null, client.database ist nie null) sowie Legacy-Funktionen aus der
alten Push-Architektur (_showNotif/_fetchTitle, ersetzt durch natives
PushService.kt) und einen leeren Noise-Suppression-Stub ohne Aufrufer.
Keine funktionale Verhaltensänderung an aktiven Code-Pfaden.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

lib/core/background_push.dart

@@ -1,6 +1,4 @@
-import 'dart:convert';
 import 'dart:io';
-import 'dart:isolate';
 import 'dart:ui';
 
 import 'package:firebase_messaging/firebase_messaging.dart';
@@ -14,8 +12,6 @@ import 'package:path_provider/path_provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:sqflite/sqflite.dart' as sqflite_native;
 
-const _kChannel = 'pyramid_messages';
-
 /// Port name used to locate the main isolate from background isolates.
 /// Registered by notification_service.dart when the app starts.
 const kMainIsolateName = 'pyramid_main';
@@ -304,99 +300,3 @@ Future<void> handleBackgroundNotificationResponse(
   print('[NOTIF-BG] background reply sent=$sent room=$roomId');
 }
 
-// ── Notification builder ──────────────────────────────────────────────────────
-
-Future<void> _showNotif({
-  required String  title,
-  required String  body,
-  required String? roomId,
-  required int     notifId,
-}) async {
-  final plugin = FlutterLocalNotificationsPlugin();
-  await plugin.initialize(
-    const InitializationSettings(
-        android: AndroidInitializationSettings('@drawable/ic_notification')),
-    onDidReceiveBackgroundNotificationResponse: handleBackgroundNotificationResponse,
-  );
-
-  await plugin.show(
-    notifId, title, body,
-    NotificationDetails(
-      android: AndroidNotificationDetails(
-        _kChannel, 'Nachrichten',
-        channelDescription: 'Neue Nachrichten',
-        importance: Importance.high,
-        priority:   Priority.high,
-        icon:       '@drawable/ic_notification',
-        color:      const Color(0xFF7B61FF),
-        groupKey:   'pyramid_messages',
-        actions: roomId != null
-            ? const [
-                AndroidNotificationAction(
-                  'reply', 'Antworten',
-                  inputs: [AndroidNotificationActionInput(label: 'Antworten…')],
-                  allowGeneratedReplies: true,
-                  showsUserInterface: false, // BroadcastReceiver path — app never opens
-                ),
-                AndroidNotificationAction(
-                  'read', 'Gelesen',
-                  showsUserInterface: false,
-                ),
-              ]
-            : const [],
-      ),
-    ),
-    payload: roomId,
-  );
-}
-
-// ── HTTP fallback — fetch sender / room name without the SDK ──────────────────
-
-Future<String?> _fetchTitle(
-    String hs, String token, String roomId, String eventId) async {
-  try {
-    final encRoom  = Uri.encodeComponent(roomId);
-    final encEvent = Uri.encodeComponent(eventId);
-
-    final rawEvent = await _get(
-        '$hs/_matrix/client/v3/rooms/$encRoom/event/$encEvent', token);
-    if (rawEvent == null) return null;
-
-    final senderId = rawEvent['sender'] as String? ?? '';
-    String senderName = senderId.split(':').first.replaceFirst('@', '');
-
-    if (senderId.isNotEmpty) {
-      final encSender = Uri.encodeComponent(senderId);
-      final memberState = await _get(
-          '$hs/_matrix/client/v3/rooms/$encRoom/state/m.room.member/$encSender',
-          token);
-      final name = memberState?['displayname'] as String?;
-      if (name != null && name.isNotEmpty) senderName = name;
-    }
-
-    final nameState =
-        await _get('$hs/_matrix/client/v3/rooms/$encRoom/state/m.room.name', token);
-    final roomName = nameState?['name'] as String?;
-
-    return roomName?.isNotEmpty == true
-        ? '$senderName · $roomName'
-        : senderName;
-  } catch (_) {
-    return null;
-  }
-}
-
-Future<Map<String, dynamic>?> _get(String url, String token) async {
-  try {
-    final req = await HttpClient()
-        .getUrl(Uri.parse(url))
-        .timeout(const Duration(seconds: 8));
-    req.headers.add('Authorization', 'Bearer $token');
-    final res = await req.close();
-    if (res.statusCode != 200) return null;
-    final raw = await res.transform(utf8.decoder).join();
-    return jsonDecode(raw) as Map<String, dynamic>;
-  } catch (_) {
-    return null;
-  }
-}

lib/core/livekit_call_manager.dart

@@ -586,8 +586,6 @@ class LiveKitCallManager with ChangeNotifier {
     }
   }
 
-  void _applyNoiseSuppression(bool enabled) {}
-
   void _startStatsLogging() {
     _stopStatsLogging();
     _statsTimer = Timer.periodic(const Duration(seconds: 5), (_) => _logStats());

lib/features/call/mini_call_widget.dart

@@ -333,7 +333,9 @@ class _ControlBtnState extends State<_ControlBtn> {
             duration: pt.durationFast,
             height: 32,
             decoration: BoxDecoration(
-              color: widget.active ? (widget.danger ? pt.danger : pt.accent) : pt.bg3,
+              color: widget.active
+                  ? (widget.danger ? pt.danger : pt.accent)
+                  : (_hovered ? pt.bgHover : pt.bg3),
               borderRadius: BorderRadius.circular(pt.rSm),
             ),
             child: Icon(

lib/features/rooms/user_panel.dart

@@ -132,16 +132,16 @@ class _ProfileRow extends StatelessWidget {
 }
 
 class _InitialAvatar extends StatelessWidget {
+  static const double _size = 32;
   final String name;
   final double radius;
-  final double size;
-  const _InitialAvatar({required this.name, required this.radius, this.size = 32});
+  const _InitialAvatar({required this.name, required this.radius});
 
   @override
   Widget build(BuildContext context) {
     return Container(
-      width: size,
-      height: size,
+      width: _size,
+      height: _size,
       decoration: BoxDecoration(
         gradient: const LinearGradient(
           begin: Alignment.topLeft,
@@ -155,7 +155,7 @@ class _InitialAvatar extends StatelessWidget {
           name.isNotEmpty ? name[0].toUpperCase() : '?',
           style: TextStyle(
             color: Colors.white,
-            fontSize: size * 0.44,
+            fontSize: _size * 0.44,
             fontWeight: FontWeight.w600,
           ),
         ),

lib/widgets/create_join_dialog.dart

@@ -518,13 +518,12 @@ class _SpaceEditDialogState extends ConsumerState<SpaceEditDialog> {
   late TextEditingController _topicCtrl;
   bool _saving = false;
   String? _error;
-  bool _saved = false;
 
   @override
   void initState() {
     super.initState();
     _nameCtrl = TextEditingController(text: widget.space.getLocalizedDisplayname());
-    _topicCtrl = TextEditingController(text: widget.space.topic ?? '');
+    _topicCtrl = TextEditingController(text: widget.space.topic);
   }
 
   @override
@@ -535,17 +534,17 @@ class _SpaceEditDialogState extends ConsumerState<SpaceEditDialog> {
   }
 
   Future<void> _save() async {
-    setState(() { _saving = true; _error = null; _saved = false; });
+    setState(() { _saving = true; _error = null; });
     try {
       final name = _nameCtrl.text.trim();
       final topic = _topicCtrl.text.trim();
       if (name.isNotEmpty && name != widget.space.getLocalizedDisplayname()) {
         await widget.space.setName(name);
       }
-      if (topic != (widget.space.topic ?? '')) {
+      if (topic != widget.space.topic) {
         await widget.space.setDescription(topic);
       }
-      if (mounted) setState(() { _saving = false; _saved = true; });
+      if (mounted) setState(() { _saving = false; });
       await Future.delayed(const Duration(seconds: 1));
       if (mounted) Navigator.of(context).pop(true);
     } catch (e) {
@@ -674,7 +673,7 @@ class _RoomSettingsDialogState extends ConsumerState<RoomSettingsDialog> {
   void initState() {
     super.initState();
     _nameCtrl = TextEditingController(text: widget.room.getLocalizedDisplayname());
-    _topicCtrl = TextEditingController(text: widget.room.topic ?? '');
+    _topicCtrl = TextEditingController(text: widget.room.topic);
   }
 
   @override
@@ -691,7 +690,7 @@ class _RoomSettingsDialogState extends ConsumerState<RoomSettingsDialog> {
         await widget.room.setName(_nameCtrl.text.trim());
       }
       final newTopic = _topicCtrl.text.trim();
-      if (newTopic != (widget.room.topic ?? '')) {
+      if (newTopic != widget.room.topic) {
         await widget.room.setDescription(newTopic);
       }
       if (mounted) Navigator.of(context).pop();

lib/widgets/pyramid_loader.dart

@@ -127,17 +127,6 @@ class _PyramidPainter extends CustomPainter {
   Offset _proj(List<double> v, double sc, double cx, double cy, double tr) =>
       Offset(cx + v[0] * sc, cy + (v[1] * cos(tr) + v[2] * sin(tr)) * sc);
 
-  double _frontness(List<List<double>> verts) {
-    final a = verts[0], b = verts[1], c = verts[2];
-    final ux = b[0]-a[0], uy = b[1]-a[1], uz = b[2]-a[2];
-    final vx = c[0]-a[0], vy = c[1]-a[1], vz = c[2]-a[2];
-    final nz = ux * vy - uy * vx;
-    final nLen = sqrt(
-      pow(uy * vz - uz * vy, 2) + pow(uz * vx - ux * vz, 2) + nz * nz,
-    );
-    return nLen == 0 ? 0 : max(0.0, -nz / nLen);
-  }
-
   Color _darken(Color c, double amount) => Color.fromARGB(
     c.alpha,
     max(0, (c.red   * (1 - amount)).round()),

lib/widgets/screen_share_picker.dart

@@ -1,4 +1,3 @@
-import 'dart:typed_data';
 import 'package:flutter/material.dart';
 import 'package:flutter_webrtc/flutter_webrtc.dart';
 import 'package:pyramid/core/theme.dart';

lib/widgets/settings_modal.dart

@@ -859,7 +859,6 @@ class _PrimaryBtn extends StatelessWidget {
   final VoidCallback? onPressed;
   final PyramidTheme pt;
   final bool loading;
-  final bool destructive;
 
   const _PrimaryBtn({
     required this.label,
@@ -867,13 +866,12 @@ class _PrimaryBtn extends StatelessWidget {
     this.icon,
     this.onPressed,
     this.loading = false,
-    this.destructive = false,
   });
 
   @override
   Widget build(BuildContext context) {
-    final bg = destructive ? pt.danger : pt.accent;
-    final fg = destructive ? Colors.white : pt.accentFg;
+    final bg = pt.accent;
+    final fg = pt.accentFg;
     return ElevatedButton.icon(
       style: ElevatedButton.styleFrom(
         backgroundColor: bg,
@@ -3626,7 +3624,6 @@ class _EncryptionSectionState extends ConsumerState<_EncryptionSection> {
     try {
       final client = await ref.read(matrixClientProvider.future);
       final db = client.database;
-      if (db == null) throw Exception('Datenbank nicht verfügbar.');
 
       final stored = await db.getAllInboundGroupSessions();
       final sessions = <Map<String, dynamic>>[];