- Add SVG favicon using pine/paper design tokens; wire into index.html
- Add SidebarLabel component with ResizeObserver overflow detection and
CSS-only tooltip (pine-deep bg, IBM Plex Mono, 0.08s fade, no delay)
- Fix Meilisearch invalid_api_key: default api key to None instead of ''
so no Authorization header is sent when auth is disabled
- Stub ResizeObserver in test setup for jsdom compatibility
- Wrap async renders in act() and advance fake timers inside act() to
eliminate all act() warnings in App.test.tsx
