useLeftConvos() filtered convos out of every list based on leave-mutation
state, working around a slow backend leaveConvo query. now that the
backend is fast, replace it with a working optimistic update: the old
onMutate used setQueryData with just the root key, which never matched
any real query, so it was a no-op. switch to setQueriesData (prefix
match) across both the convo-list and requests caches, with snapshot
rollback on error, mirroring useAcceptConversation.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Samuel Newman
fce5402e6f