# Remaining features and screen refinement

All changes are local commits on main. Nothing was pushed or deployed.

| Feature | Status | Main files | Validation / reviewer checks |
| --- | --- | --- | --- |
| 9. Ten-band EQ | Done | frontend/eq-core.js, eq-core.test.js, app.js, styles.css; docs/equalizer.md | Five-band curves migrate; live playback and EqRender share bands/presets/widening. Unit and four Classic/Glass browser cases passed. Check headphones, mono compatibility, and saved versus live processing on a real iPhone. |
| 10. Bilingual lyrics | Done | frontend/lyrics-core.js, lyrics-display.js and tests; lower-third.js, app.js, server/notes.js and tests; docs/lyric-languages.md | Primary/secondary/phonetic text preserves timing and round trips. Service, stage, Presenter and OBS use shared display logic. Frontend and 18 server notes tests passed. Check font coverage, multiline fitting and remote output on real devices. |
| 11. Piano transcription | Done; optional heavy worker awaits real inference validation | frontend/piano-core.js, piano-engine.mjs, piano.js and tests; server/piano.js and tests; scripts/piano/; docs/piano-transcription.md | Browser Basic Pitch/TFJS loads only on request, chooses WebGPU where available with WebGL/CPU fallback, caches compact notes with hand heuristic, and supports visualizer/practice queue. Real repeated browser inference passed without growing tensor count. Four server and two Python worker tests passed. ByteDance worker scaffolding, leased API contract and optional compose profile are implemented and off by default; no heavy container was started. Check a known piano recording before enabling it. |
| Downloads polish | Done | frontend/downloads-page.js and tests, offline-pages.css, downloads.js, small app.js hooks; tests/offline-pages.spec.js | Drawn SVG empty state, no empty filter, storage information and Saved link. Active/queued/paused/failed groups reuse the existing manager and confirmed cancellation. Classic/Glass at 390 and 1440 px checked. Test real slow downloads, pause/resume, failure/retry and navigation while saving. |
| Saved polish | Done | frontend/saved-page.js and test, saved-page.css, renderSaved hooks; tests/offline-pages.spec.js | Storage summary and confirmed Clear all share one row. Export/delete have separate horizontal 44 px targets and SVG icons; long titles truncate. Individual deletions confirm, and failed storage operations retain records. Existing save-to-device sheet is called unchanged. Check iPhone export/share and real storage removal. |

Common asset changes are registered in frontend/index.html and the service-worker shell list. The protected background playback methods, Classic playlist actions and save-to-device sheet were not edited.

Final checks: every frontend/*.test.js, app.js syntax, server no-bundle build, and the offline-page browser suite. Feature-specific server and Python tests were run with their respective feature commits. The 21-case settings suite and real Basic Pitch inference also passed. Offline-page tests cover all four layout/width combinations, filtering, cancellation, delete failure and action geometry.

Impeccable context loading, polish and craft-floor references were followed. Batched screenshots were assessed; final screenshots wait for the incumbent card reveal animation to finish. The manual detector found one advisory: the restrained Downloads empty-state heading is 20 px, intentionally smaller than the browsing title; no global typography change was made. The pre-existing design sidecar was reported stale and left outside this refinement.