React Query cache was shared between /app (real API) and /demo/app
(mock data) because query keys were identical. After login→logout→demo,
stale real data served from cache.
Two fixes:
1. Clear React Query cache on logout (auth store)
2. Namespace all query keys with basePath prefix so /app and /demo/app
caches are completely isolated
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Trey t