The socialStore WS-driven handlers (addFriendFromAccepted,
addIncomingRequest, removeFriendLocally, removeRequestById,
updateFriendPresence) used instance-local id:origin composite keys
for deduplication. When the client is connected to multiple instances,
both fire WS events for the same federated user with different local
IDs, bypassing the dedup and creating duplicate entries.
Switch all handlers to use homeUserId??id (canonical identity),
matching the pattern loadFriends/loadRequests already use. Also
replace the loadRequests() re-fetch in updateFriendRequest with
optimistic canonical removal to avoid racing S2S relay propagation.
Jannis Braun
016ca2c59b