feat(mobile): Saved Messages accessible from room header More Options menu

On mobile, SidebarNav (which contains BookmarksTab) is hidden while
inside a room. Added a Saved Messages toggle to the RoomMenu (···More
Options) so users can open/close the bookmarks panel without leaving
the room. Works on all screen sizes; UNTESTED on device.

Also marks Remind Me Later as done in LOTUS_TODO — it was already
fully wired (RemindMeDialog + ReminderMonitor + Message.tsx trigger).

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

src/app/features/room/RoomViewHeader.tsx

@@ -74,6 +74,8 @@ import { useLivekitSupport } from '../../hooks/useLivekitSupport';
 import { webRTCSupported } from '../../utils/rtc';
 import { MediaGallery } from './MediaGallery';
 import { usePendingKnocks } from '../../hooks/usePendingKnocks';
+import { useAtom } from 'jotai';
+import { bookmarksPanelAtom } from '../../state/bookmarksPanel';
 
 type RoomMenuProps = {
   room: Room;
@@ -96,6 +98,7 @@ const RoomMenu = forwardRef<HTMLDivElement, RoomMenuProps>(({ room, requestClose
 
   const [invitePrompt, setInvitePrompt] = useState(false);
   const [reportRoomOpen, setReportRoomOpen] = useState(false);
+  const [bookmarksOpen, setBookmarksOpen] = useAtom(bookmarksPanelAtom);
 
   const handleMarkAsRead = () => {
     markAsRead(mx, room.roomId, hideActivity);
@@ -169,6 +172,20 @@ const RoomMenu = forwardRef<HTMLDivElement, RoomMenuProps>(({ room, requestClose
       </Box>
       <Line variant="Surface" size="300" />
       <Box direction="Column" gap="100" style={{ padding: config.space.S100 }}>
+        <MenuItem
+          onClick={() => {
+            setBookmarksOpen((v) => !v);
+            requestClose();
+          }}
+          size="300"
+          after={<Icon size="100" src={Icons.Star} filled={bookmarksOpen} />}
+          radii="300"
+          aria-pressed={bookmarksOpen}
+        >
+          <Text style={{ flexGrow: 1 }} as="span" size="T300" truncate>
+            Saved Messages
+          </Text>
+        </MenuItem>
         {!isServerNotice && (
           <MenuItem
             onClick={handleInvite}