style: weitere flutter-analyze Hinweise beheben

- document_viewer: Matrix4.translate/scale durch translateByDouble/
  scaleByDouble ersetzt (PDF-Zoom-Transformation, gleiches Verhalten)
- rooms_panel: onReorder durch onReorderItem ersetzt (Index-Korrektur
  jetzt intern erledigt), implementation_imports-Hinweis kommentiert
  (SpaceChild wird vom matrix-Paket nicht öffentlich exportiert)
- voip_manager: getSources()-Override kommentiert (erzwungen durch
  abstrakte MediaDevices-Klasse, die die Methode selbst deprecated hat)
- settings_modal: BuildContext-Nutzung nach await mit context.mounted
  abgesichert (Geräte umbenennen, Passwort-Abfrage bei Massenlogout)

Verbleibend: chat_provider.dart onUpdate (Timeline-Redecrypt-Pfad,
bewusst nicht angefasst ohne dedizierten E2EE-Test, siehe PROGRESS.md).

CHANGES.md

@@ -1115,3 +1115,10 @@
 2026-07-03 06:35 [Edit] /home/steggi/pyramid/lib/features/chat/chat_view.dart
 2026-07-03 06:35 [Edit] /home/steggi/pyramid/lib/features/chat/chat_view.dart
 2026-07-03 06:35 [Edit] /home/steggi/pyramid/lib/features/chat/chat_view.dart
+2026-07-03 09:43 [Edit] /home/steggi/pyramid/lib/features/chat/document_viewer.dart
+2026-07-03 09:43 [Edit] /home/steggi/pyramid/lib/features/rooms/rooms_panel.dart
+2026-07-03 09:43 [Edit] /home/steggi/pyramid/lib/features/rooms/rooms_panel.dart
+2026-07-03 09:43 [Edit] /home/steggi/pyramid/lib/core/voip_manager.dart
+2026-07-03 09:44 [Edit] /home/steggi/pyramid/lib/core/voip_manager.dart
+2026-07-03 09:44 [Edit] /home/steggi/pyramid/lib/widgets/settings_modal.dart
+2026-07-03 09:44 [Edit] /home/steggi/pyramid/lib/widgets/settings_modal.dart

lib/core/voip_manager.dart

@@ -528,7 +528,10 @@ class MediaDevicesWrapper extends MediaDevices {
   set ondevicechange(Function(dynamic event)? callback) => _delegate.ondevicechange = callback;
   @override
   Function(dynamic event)? get ondevicechange => _delegate.ondevicechange;
+  // Erzwungener Override der abstrakten MediaDevices-Klasse, die getSources()
+  // selbst als deprecated markiert (Ersatz: enumerateDevices()) aber weiterhin verlangt.
   @override
+  // ignore: deprecated_member_use
   Future<List<dynamic>> getSources() => _delegate.getSources();
   @override
   Future<MediaDeviceInfo> selectAudioOutput([AudioOutputOptions? options]) => _delegate.selectAudioOutput(options);

lib/features/chat/document_viewer.dart

@@ -829,9 +829,9 @@ class _PdfFullscreenViewerState extends State<_PdfFullscreenViewer> {
     if ((applied - 1).abs() < 0.001) return;
     final cx = size.width / 2, cy = size.height / 2;
     final m = _tc.value.clone()
-      ..translate(cx, cy)
+      ..translateByDouble(cx, cy, 0, 1)
-      ..scale(applied)
+      ..scaleByDouble(applied, applied, applied, 1)
-      ..translate(-cx, -cy);
+      ..translateByDouble(-cx, -cy, 0, 1);
     setState(() => _tc.value = m);
   }
 

lib/features/rooms/rooms_panel.dart

@@ -3,6 +3,8 @@ import 'dart:async';
 import 'package:flutter/material.dart' hide Visibility;
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:matrix/matrix.dart';
+// SpaceChild wird vom matrix-Paket nicht öffentlich exportiert.
+// ignore: implementation_imports
 import 'package:matrix/src/utils/space_child.dart';
 import 'package:pyramid/core/app_state.dart';
 import 'package:pyramid/core/matrix_client.dart';
@@ -1173,8 +1175,7 @@ class _SpaceRoomsListState extends ConsumerState<_SpaceRoomsList> {
                 shrinkWrap: true,
                 physics: const NeverScrollableScrollPhysics(),
                 buildDefaultDragHandles: false,
-                onReorder: (oldIdx, newIdx) {
+                onReorderItem: (oldIdx, newIdx) {
-                  if (newIdx > oldIdx) newIdx--;
                   final ids = filteredDirect.map((r) => r.id).toList();
                   final moved = ids.removeAt(oldIdx);
                   ids.insert(newIdx, moved);

lib/widgets/settings_modal.dart

@@ -2499,6 +2499,7 @@ class _SessionsSectionState extends ConsumerState<_SessionsSection> {
 
   Future<void> _renameCurrentDevice(BuildContext context) async {
     final client = await ref.read(matrixClientProvider.future);
+    if (!context.mounted) return;
     final currentName = _devices
         .where((d) => d.deviceId == _currentDeviceId)
         .map((d) => d.unsigned?['device_display_name'] as String? ?? d.deviceId ?? '')
@@ -2589,7 +2590,7 @@ class _SessionsSectionState extends ConsumerState<_SessionsSection> {
     try {
       await client.deleteDevices(otherIds);
     } on MatrixException catch (e) {
-      if (e.requireAdditionalAuthentication && mounted) {
+      if (e.requireAdditionalAuthentication && context.mounted) {
         final password = await _askPassword(context, pt);
         if (password == null || !mounted) { setState(() => _logoutAllLoading = false); return; }
         try {