* [Client] Fix spurious server room join error
The server replies RespContextError when a join command is received for a
room that connection is already registered in. The client was sending such
duplicate joins in benign situations - double-clicking to join a room, or
clicking a room the selector was already auto-joining - and answered them
with a modal telling users to restart the client.
Joins for the same room are now deduplicated while one is in flight, and a
remaining RespContextError is healed by leaving and rejoining the room so
the tab appears without a client restart. Error dialogs are only shown for
user-initiated joins, so failed auto-joins no longer spam critical popups.
* [Client] Bound stale-membership room join heal to one attempt
The RespContextError heal (leave + rejoin) previously recurred
unconditionally, so a server that kept returning RespContextError for a
reason other than stale membership would loop forever. Track room ids
that already received a heal and surface the error dialog after one
attempt instead of retrying indefinitely.
* [Client] Scope room-join heal guard to one join attempt
* [Client] Hoist room-join heal guard lookup out of response switch
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Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>
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