chore: merge v4.12.1 — security, calling, editor, media fixes

Key v4.12.1 changes merged:
- Security: sanitize-html updated to v2.17.4
- Calling: video calls in DMs/rooms, user avatars during calls, right-click to start
- Calling: IncomingCallListener with ring sound and answer/reject UI
- Editor: list crash fixes (Firefox + empty headings), codeblock filename support
- Media: URL preview hover state, keyboard nav, click-to-open, OGG audio support
- Date: ISO 8601 (YYYY-MM-DD) date format option
- Misc: stable mutual rooms endpoint, Android notification crash fix

Lotus customisations preserved:
- PiP drag/resize, DM call ring notification, PTT, GIF picker, noise suppression
- Poll voting, message forwarding, image captions, location sharing
- Lotus Terminal design theme

src/app/features/room/Room.tsx

@@ -16,21 +16,26 @@ import { useMatrixClient } from '../../hooks/useMatrixClient';
 import { useRoomMembers } from '../../hooks/useRoomMembers';
 import { CallView } from '../call/CallView';
 import { RoomViewHeader } from './RoomViewHeader';
-import { callChatAtom, callEmbedAtom } from '../../state/callEmbed';
+import { callChatAtom } from '../../state/callEmbed';
 import { CallChatView } from './CallChatView';
+import { useCallEmbed } from '../../hooks/useCallEmbed';
+import { useCallMembers, useCallSession } from '../../hooks/useCall';
 
 export function Room() {
   const { eventId } = useParams();
   const room = useRoom();
   const mx = useMatrixClient();
 
+  const callSession = useCallSession(room);
+  const callMembers = useCallMembers(room, callSession);
+  const callEmbed = useCallEmbed();
+
   const [isDrawer] = useSetting(settingsAtom, 'isPeopleDrawer');
   const [hideActivity] = useSetting(settingsAtom, 'hideActivity');
   const screenSize = useScreenSizeContext();
   const powerLevels = usePowerLevels(room);
   const members = useRoomMembers(mx, room.roomId);
   const chat = useAtomValue(callChatAtom);
-  const callEmbed = useAtomValue(callEmbedAtom);
   const isDirect = useIsDirectRoom();
 
   useKeyDown(
@@ -45,7 +50,7 @@ export function Room() {
     )
   );
 
-  const callView = room.isCallRoom() || (isDirect && !!callEmbed && callEmbed.roomId === room.roomId);
+  const callView = callEmbed?.roomId === room.roomId || room.isCallRoom() || callMembers.length > 0;
 
   return (
     <PowerLevelsContextProvider value={powerLevels}>