fix(panels): eliminate getSession() from transcription store and cabinets panel

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 <[email protected]>

src/utils/tldraw/ui-overrides/components/shared/CCTranscriptionPanel.tsx

@@ -67,6 +67,7 @@ export const CCTranscriptionPanel: React.FC = () => {
     flushCanvasEvents,
     loadSessions,
     setTimetableContext,
+    setAuthInfo,
     llmConfig,
     summaryText,
     isGeneratingSummary,
@@ -93,7 +94,7 @@ export const CCTranscriptionPanel: React.FC = () => {
 
   // Modal state
   const [showSettingsModal, setShowSettingsModal] = useState(false);
-  const { user: authUser } = useAuth();
+  const { user: authUser, accessToken } = useAuth();
   const [showSummaryModal, setShowSummaryModal] = useState(false);
   const [summaryType, setSummaryType] = useState('full_lesson');
 
@@ -101,6 +102,11 @@ export const CCTranscriptionPanel: React.FC = () => {
   const [newKeyword, setNewKeyword] = useState('');
   const [isAddingKeyword, setIsAddingKeyword] = useState(false);
 
+  // Sync access token into Zustand store so all store actions can use it without getSession()
+  useEffect(() => {
+    setAuthInfo(accessToken, authUser?.id ?? null);
+  }, [accessToken, authUser?.id, setAuthInfo]);
+
   // Load sessions when auth is confirmed (avoids GoTrueClient lock on mount)
   useEffect(() => {
     if (authUser?.id) {