- Add useAuthenticatedMediaUrl hook that fetches media with auth headers
- Add AuthenticatedMedia, AuthenticatedAvatarImage components
- Update downloadMedia and downloadEncryptedMedia to accept access token
- Update all media components to pass access token for auth media
- Fix 401 errors on Matrix servers requiring authenticated media (v1.11+)
This fixes media loading in Tauri desktop apps where service workers
may not work reliably for cross-origin authenticated requests.