implemented avatar management for user profiles and chat rooms, including 1:1 cropping, integrated OCS and Spreed avatar APIs, added cache invalidation logic, and updated the account settings view to display user info and profile pictures.

lib/widget/large_profile_picture_view.dart

@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:photo_view/photo_view.dart';
 
 import '../model/account_data.dart';
-import '../model/endpoint_data.dart';
+import 'user_avatar.dart';
 
 class LargeProfilePictureView extends StatelessWidget {
   final String id;
@@ -14,14 +14,6 @@ class LargeProfilePictureView extends StatelessWidget {
     super.key,
   });
 
-  String _imageUrl() {
-    final host = EndpointData().nextcloud().full();
-    if (isGroup) {
-      return 'https://$host/ocs/v2.php/apps/spreed/api/v1/room/$id/avatar';
-    }
-    return 'https://$host/avatar/$id/1024';
-  }
-
   @override
   Widget build(BuildContext context) => Scaffold(
     appBar: AppBar(title: Text(isGroup ? 'Gruppenbild' : 'Profilbild')),
@@ -29,7 +21,7 @@ class LargeProfilePictureView extends StatelessWidget {
       minScale: 0.5,
       maxScale: 3.0,
       imageProvider: Image.network(
-        _imageUrl(),
+        avatarUrl(id: id, isGroup: isGroup, size: 1024),
         headers: {'Authorization': AccountData().getBasicAuthHeader()},
       ).image,
       backgroundDecoration: BoxDecoration(