enhance(frontend): フォロー/フォロワー非公開時の表示を改善

Close #10934
Resolve #10887

packages/frontend/src/scripts/isFfVisibleForMe.ts

@@ -0,0 +1,11 @@
+import * as misskey from 'misskey-js';
+import { $i } from '@/account';
+
+export function isFfVisibleForMe(user: misskey.entities.UserDetailed): boolean {
+	if ($i && $i.id === user.id) return true;
+
+	if (user.ffVisibility === 'private') return false;
+	if (user.ffVisibility === 'followers' && !user.isFollowing) return false;
+
+	return true;
+}