[A-EDev]

Summary

Music player follow-up 3 of 4. Stacked on feat/music-side-pane (PR #201); review and merge in order.

• WebKit on macOS reports YouTube's fragmented MP4 audio (itag 140 and 139) at exactly twice its length. The file's header is right (mvhd, mdhd and sidx agree) and the clock runs at normal speed, so a song played to its real end and then ran on in silence. Opus is reported correctly. This also affected the Medium quality setting, which already picked AAC.
• The engine keeps each song's listed length (approxDurationMs, or the song's own length for a download). When the element reports well past it, the player shows the listed length and ends the song there, so the next one starts on time.

Related issue

Change type

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

Validation

• pnpm test: 754 tests passed, 0 failed
• pnpm build: passed
• cargo fmt --manifest-path src-tauri/Cargo.toml --all -- --check: not run on this branch (no Rust changes); clean at the top of the stack
• cargo clippy --manifest-path src-tauri/Cargo.toml --all-targets --all-features: not run on this branch (no Rust changes); no new warnings at the top of the stack
• cargo test --manifest-path src-tauri/Cargo.toml --all-targets --all-features: not run on this branch (no Rust changes); 825 passed, 0 failed at the top of the stack
• I smoke-tested the affected desktop behavior. macOS: a 4:05 song reported at 8:10 now shows 4:05, and the next song started at the real end.
• OS/device: the owner tested a local build of the whole stack on macOS. Windows and Linux were not run; the correction only applies when the reported length is well past the listed one.

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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