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/hooks/usePresenceUpdater.ts

@@ -17,22 +17,26 @@ export function usePresenceUpdater() {
 
   useEffect(() => {
     const userId = mx.getUserId();
-    const storedStatus = userId ? localStorage.getItem(`lotus-status-msg-${userId}`) ?? '' : '';
+    const storedStatus = userId ? (localStorage.getItem(`lotus-status-msg-${userId}`) ?? '') : '';
 
     const setOnline = () =>
-      mx.setPresence({
-        presence: 'online',
-        ...(storedStatus ? { status_msg: storedStatus } : {}),
-      }).catch(() => undefined);
+      mx
+        .setPresence({
+          presence: 'online',
+          ...(storedStatus ? { status_msg: storedStatus } : {}),
+        })
+        .catch(() => undefined);
     const setUnavailable = (statusMsg?: string) =>
-      mx.setPresence({
-        presence: 'unavailable',
-        ...(statusMsg
-          ? { status_msg: statusMsg }
-          : storedStatus
-            ? { status_msg: storedStatus }
-            : {}),
-      }).catch(() => undefined);
+      mx
+        .setPresence({
+          presence: 'unavailable',
+          ...(statusMsg
+            ? { status_msg: statusMsg }
+            : storedStatus
+              ? { status_msg: storedStatus }
+              : {}),
+        })
+        .catch(() => undefined);
     const setOffline = () =>
       mx.setPresence({ presence: 'offline', status_msg: '' }).catch(() => undefined);
 
@@ -88,7 +92,6 @@ export function usePresenceUpdater() {
     };
 
     const handlePageHide = () => {
-      const userId = mx.getUserId();
       const token = mx.getAccessToken();
       const baseUrl = mx.getHomeserverUrl();
       if (!userId || !token || !baseUrl) return;