Remove redundant information from the Album overview page

[MarvinSchenkel]

What

Reduces redundant information on the album detail track list so the track title is the dominant element on each row.

• Subtitle: shows only collaborating artists (with X), dropping the album artist / album name / year that is already shown in the page header. Tracks performed solely by the album artist have no subtitle.
• Left gutter: the per-row album art is replaced by a play button (the album art is already in the header) and the track number is shown beside it.
• Duration: right-aligned before the provider icon, and hidden on mobile to give the title more horizontal room.
• Multi-disc albums: Disc X section headers are inserted before each disc's tracks (only in the default track-number sort order, where disc grouping is contiguous).
• Long titles wrap to two lines instead of truncating.

All of this is scoped to the album track list via an albumTrackView flag (itemtype === 'albumtracks'); every other track list (playlists, artist tracks, search, queue) is unchanged.

Why

The album page is already scoped to one album by one artist, so repeating artist • album • year on every row is noise. This declutters the view and gives the most important information — the track title — more prominence.

How to test

1. Open an album with featured/collaborating artists (e.g. a Deluxe album). Confirm rows show only with <collaborator> and no album • year; tracks by just the album artist show no subtitle.
2. Confirm the row shows a play button + track number on the left instead of album art, and the duration is right-aligned (and hidden on mobile).
3. Open a multi-disc album in default order and confirm Disc 1 / Disc 2 headers appear; switch sort and confirm headers disappear; open a single-disc album and confirm no headers.
4. Regression: open a playlist, an artist page and search results — track rows still show the full artist • album • year subtitle as before.

[Copilot]

Pull request overview

This PR refines album detail track lists to reduce repeated album context and emphasize track titles while leaving other track list views unchanged.

Changes:

• Adds album-track-specific title/subtitle, prepend, and duration layout in ListviewItem.
• Adds disc headers for multi-disc albums in default track-number order.
• Adds English i18n keys for collaborator subtitles and disc headers.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
src/translations/en.json	Adds English labels for collaborator subtitles and disc headers.
src/components/ListviewItemTitle.vue	Allows album track titles to wrap to two lines with album-specific styling.
src/components/ListviewItem.vue	Adds album-track-specific collaborator subtitle, play/track-number gutter, and append duration.
src/components/ItemsListing.vue	Inserts virtual-list disc header rows for multi-disc album track listings.

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