Engraved score display, chord backing toggle, follow the recording

Piano-only score playback

Retry rate-limited engine connections and connect by Space URL

Schedule score notes live to eliminate full-score rendering on instrument changes

Fix audio unlock deadlock and prepare instrument playback early

Add playback instrument selection with piano as default

Improve score playback controls and default audio volume

Remove YouTube imports and focus on uploads and recording

Fix sign-in in the Hugging Face frame and prevent stalled theme waves

Launch Score Studio with Hugging Face sign-in and dedicated ZeroGPU API