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/call-status/CallRoomName.tsx

@@ -1,6 +1,6 @@
 import React from 'react';
 import { Room } from 'matrix-js-sdk';
-import { Chip, Text } from 'folds';
+import { Chip, Icon, Icons, Text } from 'folds';
 import { useAtomValue } from 'jotai';
 import { useRoomName } from '../../hooks/useRoomMeta';
 import { RoomIcon } from '../../components/room-avatar';
@@ -38,7 +38,11 @@ export function CallRoomName({ room }: CallRoomNameProps) {
       variant="Background"
       radii="Pill"
       before={
-        <RoomIcon size="200" joinRule={room.getJoinRule()} roomType={room.getType()} filled />
+        dm ? (
+          <Icon size="200" src={Icons.VolumeHigh} filled />
+        ) : (
+          <RoomIcon size="200" joinRule={room.getJoinRule()} roomType={room.getType()} filled />
+        )
       }
       onClick={() => navigateRoom(room.roomId)}
     >