The onAuthenticationFailed handler is created once per page (effect keyed on
pageId), so it closed over the initial collab token and decoded a STALE value
after a refetch. Worse, jwtDecode(undefined) throws, so when the token had not
loaded (or the request failed) the handler crashed before it could refetch and
reconnect — leaving the editor stuck disconnected.
Mirror the latest token into a ref the handler reads live, and guard the decode:
a missing or malformed token is treated as 'needs refresh' so it refetches and
reconnects instead of throwing. A valid, unexpired token still early-returns.
Also remove two local useState sync flags (isLocalSynced/isRemoteSynced) that
were set but never read — the header indicator consumes the Jotai atoms, and the
hook's return values were never destructured by any caller. The setter wrappers
now drive only the atoms.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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