fix: ESLint errors and Prettier formatting

ESLint errors:
- usePresenceUpdater: remove redundant `const userId` inside handlePageHide
  that shadowed the outer declaration (no-shadow)
- RoomViewHeader: prefix unused encryptedRoom with _ (no-unused-vars)

Prettier: reformat 14 files to match project style

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/features/settings/account/Profile.tsx

@@ -738,7 +738,9 @@ function ProfileTimezone() {
   const [savedTimezone, setSavedTimezone] = useState<string>('');
 
   useEffect(() => {
-    const cached = mx.getAccountData('im.lotus.timezone' as any)?.getContent<{ timezone: string }>();
+    const cached = mx
+      .getAccountData('im.lotus.timezone' as any)
+      ?.getContent<{ timezone: string }>();
     if (cached?.timezone) {
       setTimezone(cached.timezone);
       setSavedTimezone(cached.timezone);