fix: media gallery encrypted rooms + Ctrl+K double-menu

- MediaGallery: switch from createMessagesRequest (returns raw encrypted
  events) to room.getLiveTimeline().getEvents() which gives already-
  decrypted MatrixEvent objects. Load More uses paginateEventTimeline().
- QuickSwitcher: change hotkey from Ctrl+K to Ctrl+P to avoid conflict
  with the existing SearchModalRenderer mod+k handler

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

src/app/pages/client/ClientNonUIFeatures.tsx

@@ -267,7 +267,7 @@ function QuickSwitcherFeature() {
 
   useEffect(() => {
     const handleKeyDown = (e: KeyboardEvent) => {
-      if ((e.ctrlKey || e.metaKey) && e.key === 'k') {
+      if ((e.ctrlKey || e.metaKey) && e.key === 'p') {
         e.preventDefault();
         setOpen(true);
       }