style: apply prettier across fork files

check:prettier was not part of my gate routine, so formatting drift accumulated
across the session's touched files (and a few older ones). Run prettier --write
to bring the repo back to 'All matched files use Prettier code style!'.
Formatting only — no logic changes. tsc/tests/build all green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/utils/bookmarks.test.ts

@@ -64,12 +64,7 @@ test('sortBookmarks does not mutate its input', () => {
 });
 
 test('groupBookmarksByRoom buckets by room, newest-first within a group', () => {
-  const input = [
-    bk('a', 'r1', 100),
-    bk('b', 'r2', 500),
-    bk('c', 'r1', 300),
-    bk('d', 'r2', 200),
-  ];
+  const input = [bk('a', 'r1', 100), bk('b', 'r2', 500), bk('c', 'r1', 300), bk('d', 'r2', 200)];
   const groups = groupBookmarksByRoom(input);
   assert.equal(groups.length, 2);
   const r1 = groups.find((g) => g.roomId === 'r1')!;