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`