add ticker page bloc and avatar disk cache

lib/main.dart

@@ -51,6 +51,7 @@ import 'utils/downloads/download_manager.dart';
 import 'view/login/login.dart';
 import 'view/login/post_login_splash.dart';
 import 'widget/app_progress_indicator.dart';
+import 'widget/avatar_disk_cache.dart';
 import 'widget/breaker/breaker.dart';
 import 'widget/debug/cache_view.dart';
 import 'widget/downloads/download_tray.dart';
@@ -150,6 +151,11 @@ Future<void> main() async {
     );
   }
 
+  // Resolve the avatar cache directory ahead of the first avatar render so the
+  // synchronous disk read hits and cold-start avatars appear without a blank
+  // placeholder flash.
+  AvatarDiskCache.instance.warmUp();
+
   if (kReleaseMode) {
     ErrorWidget.builder = (error) => Material(
       color: Colors.white,