route avatar crop and profile view through AppRoutes

lib/routing/app_routes.dart

@@ -37,8 +37,10 @@ import '../view/pages/talk/talk_navigator.dart';
 import '../view/pages/ticker/ticker_page_view.dart';
 import '../view/pages/timetable/custom_events/custom_events_view.dart';
 import '../view/pages/timetable/subject_colors/subject_colors_view.dart';
+import '../widget/avatar_crop_page.dart';
 import '../widget/debug/cache_view.dart';
 import '../widget/file_viewer.dart';
+import '../widget/large_profile_picture_view.dart';
 import '../widget/user_avatar.dart';
 
 /// Single entry point for full-page navigations. Dialogs and bottom sheets
@@ -95,6 +97,30 @@ class AppRoutes {
     pushScreen(context, withNavBar: false, screen: const SubjectColorsView());
   }
 
+  /// Opens the full-screen cropper on [imageBytes] and resolves to the cropped
+  /// bytes (or null if cancelled). [aspectRatio] defaults to 1:1 for avatars;
+  /// pass null for a free-form crop (e.g. chat backgrounds).
+  static Future<Uint8List?> openAvatarCrop(
+    BuildContext context, {
+    required Uint8List imageBytes,
+    double? aspectRatio = 1,
+  }) {
+    return Navigator.of(context).push<Uint8List>(
+      MaterialPageRoute(
+        fullscreenDialog: true,
+        builder: (_) =>
+            AvatarCropPage(imageBytes: imageBytes, aspectRatio: aspectRatio),
+      ),
+    );
+  }
+
+  /// Opens the tappable, zoomable profile-picture viewer for [id].
+  static void openLargeProfilePicture(BuildContext context, String id) {
+    Navigator.of(context).push(
+      MaterialPageRoute<void>(builder: (_) => LargeProfilePictureView(id: id)),
+    );
+  }
+
   /// Opens the picker for choosing a foreign timetable element and resolves to
   /// the selected element (or null if dismissed). The timetable view renders
   /// the chosen plan inline. Gated behind the `viewForeignTimetables`

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

@@ -5,6 +5,7 @@ import '../../../../api/marianumcloud/cloud_users/cloud_users_actions.dart';
 import '../../../../api/marianumconnect/queries/auth_logout/auth_logout.dart';
 import '../../../../model/account_data.dart';
 import '../../../../push/push_registration.dart';
+import '../../../../routing/app_routes.dart';
 import '../../../../state/app/modules/account/bloc/account_bloc.dart';
 import '../../../../state/app/modules/account/bloc/account_state.dart';
 import '../../../../widget/app_progress_indicator.dart';
@@ -12,7 +13,6 @@ import '../../../../widget/async_action_button.dart';
 import '../../../../widget/avatar_actions_sheet.dart';
 import '../../../../widget/confirm_dialog.dart';
 import '../../../../widget/demo_restricted.dart';
-import '../../../../widget/large_profile_picture_view.dart';
 import '../../../../widget/user_avatar.dart';
 
 // Display-name is process-wide stable until the user logs out; cache it so
@@ -107,12 +107,8 @@ class _AccountSectionState extends State<AccountSection> {
                   children: [
                     Center(
                       child: GestureDetector(
-                        onTap: () => Navigator.of(context).push(
-                          MaterialPageRoute<void>(
-                            builder: (_) =>
-                                LargeProfilePictureView(id: username),
-                          ),
-                        ),
+                        onTap: () =>
+                            AppRoutes.openLargeProfilePicture(context, username),
                         child: UserAvatar(
                           key: ValueKey(_avatarVersion),
                           id: username,

lib/widget/avatar_actions_sheet.dart

@@ -3,7 +3,7 @@ import 'dart:typed_data';
 import 'package:flutter/material.dart';
 import 'package:image_picker/image_picker.dart';
 
-import 'avatar_crop_page.dart';
+import '../routing/app_routes.dart';
 import 'file_pick.dart';
 
 /// Result of the user's choice inside [showAvatarActionsSheet]. The sheet
@@ -107,10 +107,5 @@ Future<Uint8List?> _pickAndCrop(
   if (picked == null) return null;
   final bytes = await picked.readAsBytes();
   if (!context.mounted) return null;
-  return Navigator.of(context).push<Uint8List>(
-    MaterialPageRoute(
-      fullscreenDialog: true,
-      builder: (_) => AvatarCropPage(imageBytes: bytes),
-    ),
-  );
+  return AppRoutes.openAvatarCrop(context, imageBytes: bytes);
 }

lib/widget/chat_background_picker_sheet.dart

@@ -3,7 +3,7 @@ import 'dart:typed_data';
 import 'package:flutter/material.dart';
 import 'package:image_picker/image_picker.dart';
 
-import 'avatar_crop_page.dart';
+import '../routing/app_routes.dart';
 import 'file_pick.dart';
 
 /// Bottom sheet with "from gallery" and "take photo" actions for choosing a
@@ -61,12 +61,7 @@ Future<Uint8List?> showChatBackgroundPickerSheet(BuildContext context) async {
 Future<Uint8List?> cropChatBackgroundImage(
   BuildContext context,
   Uint8List bytes,
-) => Navigator.of(context).push<Uint8List>(
-  MaterialPageRoute(
-    fullscreenDialog: true,
-    builder: (_) => AvatarCropPage(imageBytes: bytes, aspectRatio: null),
-  ),
-);
+) => AppRoutes.openAvatarCrop(context, imageBytes: bytes, aspectRatio: null);
 
 Future<Uint8List?> _pickRaw(Future<XFile?> Function() pick) async {
   final picked = await pick();