- Topbar: Changed Load Session to Reload Session with refresh icon
- Settings cog: Added session picker dropdown in SESSION section
- New endpoint: GET /config_tester/list_sessions returns sessions with
metadata (name, item count, first image, modification time)
- Landing page: Shows session cards with thumbnails when no session loaded
- Click any card or use dropdown to load a session
- Landing page auto-hides when session data loads
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>