Web client: trustDevice now defaults to true so a refresh token is always
issued on login, preventing deauth after the 1-hour access token expiry.
Users can still uncheck the box on shared devices.
Bot: cache file path is now env-configurable (BOT_CACHE_FILE) and
defaults to /app/cache/user_cache.pkl. Docker Compose mounts a named
volume at /app/cache so the session cache survives container restarts.
saveCache() now creates the directory if it doesn't exist.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
chelsea
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