Previously markAsRead() only sent m.read receipts via sendReadReceipt().
This meant the read position was not persisted across page refreshes,
especially noticeable in bridged rooms.
Now uses setRoomReadMarkers() which sets both:
- m.fully_read marker (persistent read position)
- m.read receipt
Fixes issue where rooms would still show as unread after refresh.
Andrew Murphy
Ajay Bura