feat(metadata): add advanced editor

[flamboh]

Summary

• add a Settings-gated Advanced mode for album artist, disc number, composer, BPM, and comments
• swap the editor between normal and advanced metadata views
• keep album artist linked by default and honor metadata-link policy
• expose track-number syncing exactly once under General settings

Projection safety

• centralize advanced numeric validation for preview, single-track, album, and library projections
• prevent invalid disc/BPM values from entering pending patches, materialized files, bulk exports, direct writes, or hydration recovery
• distinguish malformed NaN/present undefined from intentional null clears
• preserve last-valid/parsed metadata and unrelated valid pending edits across success and write-error paths

Verification

• vp check
• bun run typecheck
• bun run test (443 tests)
• bun run build
• two fresh reviewers plus repeated rechecks through form, pending-patch, direct-write, and hydration edge cases

Dependency

Targets #122 (codex/metadata-policy-core).

[github-actions]

React Doctor found no new issues. 🎉

_{Reviewed by React Doctor for commit ca4e774.}

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	tagium	ca4e774	Commit Preview URL Branch Preview URL	Jul 23 2026, 04:56 AM

[flamboh]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat(audio): add waveform preview playback #127
• feat(ui): add mobile workspace navigation #125
• feat(export): confirm bulk downloads #123
• feat(metadata): reopen cleanup suggestions #121
• feat(ui): polish workspace states #120
• feat(metadata): add advanced editor #124 👈 (View in Graphite)
• feat(metadata): add advanced field policy #122
• refactor(audio): make formats explicit #119
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[flamboh]

Superseded together with #122 by the combined advanced metadata rebuild in #137.