feat(tag-editor): add batch metadata editor with artwork support

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New metadata editor accessible via "Edit Metadata" in the song, album,
and playlist song context menus. Supports editing one or more files at once.

Tags:
- Displays all metadata fields for the selected files
- Fields differing across files are shown as "(Multiple Values)"
- Fields can be added from a dropdown or removed individually
- Only modified fields are written back to disk

Artwork:
- Displays shared cover art across all selected files
- Supports setting new artwork via file picker or drag-and-drop
- Supports clearing existing artwork
- Shows a placeholder when selected files have different covers

Reading and writing:
- Tags are read via music-metadata, preserving full ISO date strings
- Writes use taglib-wasm WASI in-place editing via setProperty,
  only touching fields that were explicitly changed
- Writability of all files is checked before any writes begin
- Partial read failures show a warning but still allow editing

Other:
- Per-file batch progress is reported during reads and writes
- In-flight reads are cancelled when the modal is closed
- An optional server library rescan can be triggered after saving

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This commit is contained in:

ChrisScott9456

2026-06-14 22:52:30 -04:00

parent 4297d0d5b3

commit 7e82ab146e

31 changed files with 3808 additions and 2193 deletions

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