Bulk ID3 cleanup tooling (stretch — may slip to v1.3)

[LeoHChen]

Stretch goal flag: this may not ship in v1.2. File now so the design conversation can run alongside #114, but if v1.2 fills up before this is solid, slip it to v1.3 without guilt.

Companion to the per-track ID3 edit work (#114). Let the user run an AI-assisted batch cleanup over an entire drive (or a selection of tracks). Same on-device-or-cloud branching, same privacy posture, with proper long-running-operation affordances.

Scope

• Selection model: whole drive, an artist, an album, a playlist, or a multi-select from a list view.
• Same suggestion types as ID3 edit sheet (Tier 1) + AI-suggested fixes (Tier 2) #114 Tier 2 (capitalization, typos, feat. normalization, missing albumArtist).
• Stop / Resume affordance — the user can pause mid-batch and resume later without re-suggesting tracks already reviewed.
• Progress UI with current / total and ETA.
• "What changed" report at the end: list of tracks, fields that changed, per-track accept/reject (so the user can audit and roll back if needed).
• Rollback: keep a journal of changes per batch so the user can revert the whole batch within some window (or until the next batch — TBD in design).

Privacy posture

• Same opt-in toggle as ID3 edit sheet (Tier 1) + AI-suggested fixes (Tier 2) #114 Tier 2. If the user has cloud disabled and on-device unavailable, the Bulk Cleanup entry point is hidden (same pattern as Hide AI Smart Play UI when no provider is reachable (#101) #102).
• For cloud, a clear pre-flight: "This will send N track titles/artists/albums to for analysis."

Acceptance

• Tier 2 of ID3 edit sheet (Tier 1) + AI-suggested fixes (Tier 2) #114 must be merged first.
• Bulk pass runs on a representative drive (≥1000 tracks), can be stopped + resumed, produces a report, and rollback works on the entire batch.
• No thermal red zone; no UI blocking.

Related

• Hard dependency: ID3 edit sheet (Tier 1) + AI-suggested fixes (Tier 2) #114 (Tier 2 must ship first).
• Substrate: Hide AI Smart Play UI when no provider is reachable (#101) #102 (AI provider gating), Add opt-in online artwork fetcher (MusicBrainz + Cover Art Archive) #74 / Opt-in artist-photo fetcher (closes #93) #94 (privacy toggles), Indexer: skip work when drive is unchanged; incremental otherwise (closes #55) #62 (incremental indexer pattern — useful precedent for resumable long-running ops).