implemented a customizable chat background system with support for patterns, solid colors, and gallery images; added a dedicated settings page with live preview and adjustable blur/dim effects, updated the image cropper to support flexible aspect ratios for wallpapers, and integrated file cleanup logic during account logout.

lib/view/pages/settings/sections/talk_section.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 
 import '../../../../notification/notify_updater.dart';
+import '../../../../routing/app_routes.dart';
 import '../../../../state/app/modules/settings/bloc/settings_cubit.dart';
 import '../../../../utils/haptics.dart';
 import '../../../../widget/centered_leading.dart';
@@ -39,6 +40,13 @@ class TalkSection extends StatelessWidget {
             },
           ),
         ),
+        ListTile(
+          leading: const Icon(Icons.wallpaper_outlined),
+          title: const Text('Chat-Hintergrund'),
+          subtitle: const Text('Bild, Farbe und Darstellung anpassen'),
+          trailing: const Icon(Icons.arrow_right),
+          onTap: () => AppRoutes.openChatBackgroundSettings(context),
+        ),
         ListTile(
           leading: const CenteredLeading(
             Icon(Icons.notifications_active_outlined),