[A-EDev]

Summary

Part 19 of 22 of the music player plan (Android parity). Stacked on feat/lyrics-providers (PR #195); review and merge in order.

• Android's lyrics panel, rows, motion and karaoke drawing ported: springs with the expressive motion tokens, staggered row motion, depth scale, alpha and blur by distance (no blur on Linux), word fill with a soft front, word lift, held-note glow, duets, background vocals, synthesized timing for line-synced lyrics, an instrumental indicator.
• Only the sung line redraws per frame, and nothing runs while paused, hidden or out of view.
• A lyrics menu: sync offset, choose source, edit, copy, save .lrc, alignment, translation and romanization.

Related issue

Change type

• Bug fix
• Feature
• Refactor or maintenance
• Documentation
• Build, packaging, or CI

Validation

• pnpm test: 725 tests passed, 0 failed
• pnpm build: passed
• cargo fmt --manifest-path src-tauri/Cargo.toml --all -- --check: clean
• cargo clippy --manifest-path src-tauri/Cargo.toml --all-targets --all-features: no new warnings against main (compared at the top of the stack)
• cargo test --manifest-path src-tauri/Cargo.toml --all-targets --all-features: 823 passed, 0 failed (all sync_* suites included)
• I smoke-tested the affected desktop behavior. macOS: karaoke fill on the sung line in the side pane (screenshot); 0 frame callbacks while paused.
• OS/device: device testing by the owner. The checks above ran on macOS 27 (Apple Silicon MacBook Pro, 120 Hz) in a dev build of the whole stack; Windows and Linux were not run.

Screenshots or recordings

Risk and compatibility

• No new secrets, private data, telemetry, or broad Tauri permissions were introduced.
• User-facing documentation was updated where needed (changelog entry in v0.1.0-beta3.txt).
• Dependency and lockfile changes are intentional and limited to this PR. No dependency changes.
• Breaking changes and upgrade steps are clearly documented. No breaking changes.

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