feat: implement full rating system - empty stars, hover preview, per-thread storage, admin badge

perf: remove unnecessary asyncio lock in get_session to improve read performance (file writes are already atomic via os.replace)

fix: resolve race condition in get_session by adding async lock to prevent reading partially written JSON files

Integrate RAG v1.2 admin panel and handoff features

fix(backend): allow renaming sessions before first message is sent

fix: implement session merging to allow multiple logins for the same user without splitting history

Fix admin panel showing 'default name': update user_name in-place on rename, improve session list display

Upload 47 files

wipe space

Initialize user_name as 'default name' and rename upon profile fetch

Implement session renaming so user name replaces session ID

Integrate user name fetching, session persistence, and local lottie icon

Fix HF persistence: diagnostics, non-root user for permissions, and dynamic path retrieval

Add logging to debug session saving

Enable persistent storage for sessions and index

feat: add secure admin panel, session store, localStorage tracking