This makes kazv consider an event as read when either the local read marker or the remote read receipt from sync has it.

Requires: https://iron.lily-is.land/D204

Type: fix

BUG: https://iron.lily-is.land/T113

Send from another session a message that generates a notification.
Open kazv to receive the message and the notification but do not mark it as read.
Reopen kazv with an invalid proxy (https_proxy=socks5://localhost:12345) such that you cannot make any internet requests, and switch to that room.
Verify the room is marked as read.
Reopen kazv removing the proxy, and switch to that room again. Verify a request is sent to the server updating the read receipt.