Same GoTrueClient lock contention fix as CCFilesPanel:
- transcriptionStore: add _accessToken/_userId state + setAuthInfo() action;
replace all 6 getSession() calls (startSession, flushCanvasEvents, loadSessions,
loadKeywordWatches, addKeywordWatch, deleteKeywordWatch, checkSegmentForKeywords)
with stored values — zero getSession() calls remain in the store
- CCTranscriptionPanel: destructure accessToken from useAuth; sync both values into
store via setAuthInfo() on every auth change; gate loadSessions on authUser.id
- CCCabinetsPanel: same pattern as CCFilesPanel — useAuth for token, useCallback on
apiFetch/loadCabinets, gate effect on authUser.id
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>