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/poll.test.ts

@@ -201,7 +201,7 @@ test('parseResponseAnswerIds reads stable m.selections and unstable nested answe
   assert.deepEqual(parseResponseAnswerIds({ 'm.selections': ['0', '1'] }), ['0', '1']);
   assert.deepEqual(
     parseResponseAnswerIds({ 'org.matrix.msc3381.poll.response': { answers: ['a'] } }),
-    ['a']
+    ['a'],
   );
   assert.deepEqual(parseResponseAnswerIds({}), []);
 });