feat(database): shape the library like files, and shrink the catalog

Plans 013 and 014, the album page that prompted them, and the smaller
fixes they turned up. Changelog, largest first.

## The local library is shaped like files, not like MusicBrainz

`audio_files` carries its own tags and points at `albums` and
`artists`; `file_genres` is the one real many-to-many. `recordings`,
`release_group_recordings`, `artist_credit`, `artist_credit_artist`,
`recording_genres`, `release_groups` and `release_to_rg` are gone from
the local side, and with them a six-way join in every read, a
`MIN(release_group_id)` subquery in eleven queries and a
first-credited-artist subquery in nine. Measured on a real 25,966-file
library, every many-to-many that model expressed was 1:1 in the data.

- Ownership is a file. `GetFilePathsByRecordingMBIDs`,
  `LibraryMBIDIndex.CheckMBIDs`, `collectLibraryEntities` and
  `pruneStaleLocalCrossReferences` all join `audio_files`, so the 812
  orphaned recordings, 216 release groups and 260 artists that library
  carried are now structurally impossible.
- One projection: every track query selects from the `track_metadata`
  view, one row type, one mapper. Nine hand-rolled copies had drifted
  far enough to report different years on different screens.
- `library_id = 0` means every library, so each list query exists once
  instead of scoped and unscoped with a branch at every call site.
- No migration chain. `sql/schemas/` is the one description of the
  shape; `sql/migrations/`, `applyMigrations` and `schema_migrations`
  are squashed away, along with the drift between them that had sqlc
  generating against a stale schema.
- `database.InsertTestTrack` is the one test seeder; twenty test files
  had been assembling the old FK chain each in its own order.

## The catalog stores its ids as bytes

`explore_index`'s three 36-char MBID columns and its entity-type text
are 16 raw bytes and a small integer. The table and its six indexes go
780 MB to 405 MB on a real 2,052,200-row catalog, which is why a fresh
install is ~0.6 GB rather than ~1.0 GB.

- `backend/explore/mbid.go` is the only place the encoding is known;
  everything above it speaks dashed strings.
- `CHECK(length(mbid) = 16)` makes a stringly write fail at the insert
  rather than silently returning no rows, since SQLite does not coerce
  between TEXT and BLOB.
- The importer asks the artifact what encoding it carries and converts
  on the way in, so the artifact already published keeps working and no
  format bump is needed.
- `indexRowColumns`/`scanIndexRow` replace four copies of a 22-column
  list, and `TestStoredEncodingRoundTrips` sweeps every read path.

## An album page that says how much of the album is yours

- One question, asked once: is there a file. `filePaths` is filled by a
  single batched lookup when the tracklist settles, and the badge, the
  Play count, the dimmed rows and every menu item read it — replacing
  four claims of decreasing confidence that could show a green tick on
  an album whose every action did nothing.
- Play, Play 7 of 12, or no play button at all.
- `total_tracks` on `explore_index` (~2 bytes over 400,677 release
  groups) and on `audio_files` from tags that have always carried it:
  a complete MBID-matched album now makes no catalog call at all, where
  it used to spend the most expensive request the app makes.
- A merged cluster shows the running order the most releases agree on,
  and the version list marks the release you own rather than standing a
  synthetic entry in for it.
- `AlbumReleasesFailed`: a slow fetch is no longer reported as a failed
  one by a 12-second timer.
- Rows not in the library are dimmed in place (with `aria-disabled`)
  instead of the owned ones wearing a green tick and a legend.

## Caches and cover art get ceilings

- Only the three tiers of a cover are stored; the full-resolution copy
  nothing rendered was 1,134 MB of a 1.4 GB covers directory.
- One artist portrait is downloaded and the rest are remembered as
  URLs — 4.1 GB of a 5.3 GB cache was candidates no code path reads.
- `browsedArtBudget` and `httpCacheBudget` bound what an age cannot:
  the same install held art for 5,770 artists in a 1,301-artist
  library.
- `OrphanedArtistImagesJob` joined a bare MBID onto a sharded
  directory, so it deleted the rows that were the only record of the
  files it left behind. `explore.ArtistImageDir` is that layout's one
  definition now.

## The autotag queue asks whether there is work

`tagging_items` was a row per album folder, not a queue, and no query
read the `tag_status` column that held the answer. The four queue
queries ask the files, which matters most where it is least visible:
`startPrefetch` was scoring every album in a tagged library against
MusicBrainz.

## Phantom playlist tracks resolve in place

An M3U8 imported before its files leaves phantom rows; they now match
by path and fall back to position, keep their place in the playlist
when resolved, and pair best-first so two phantoms cannot claim the
same file.

## Playing a track plays the list it is in

Double-click, and Play on a single row's menu, queue the list as
displayed with `startIndex` on that row — the album page and the track
list used to queue one track and discard the album around it. A
multi-row selection still plays exactly itself.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AfVYUVExXsx1nSWrXN8mAh

frontend/test/components/album-actions.test.ts

@@ -18,7 +18,7 @@ import { describe, expect, it, beforeEach } from 'vitest';
 import type { LitElement } from 'lit';
 
 import '@components/explore-album-details/explore-album-details';
-import { stub, flush, resetHarness, calls } from '@test/support/harness';
+import { stub, flush, resetHarness, calls, lastArgs } from '@test/support/harness';
 import { fixture, shadow, shadowAll, text } from '@test/support/render';
 
 type Version = {
@@ -52,6 +52,12 @@ function track(n: number, owned: boolean) {
  * The component builds its versions from fetched releases; this reaches
  * past that and sets the state the header actually reads, which is the
  * only part under test here.
+ *
+ * Owning a track means the library has a *file* for it — the page
+ * resolves the displayed tracklist's paths once and every action, badge
+ * and dimmed row reads that one answer. So the fixture says which
+ * tracks have files rather than setting an `inLibrary` flag, which is
+ * what used to be able to claim ownership of something unplayable.
  */
 async function withVersion(
   owned: number,
@@ -61,11 +67,20 @@ async function withVersion(
     albumName: 'Glass Harbour',
   });
 
+  const tracks = Array.from({ length: total }, (_, i) => track(i + 1, i < owned));
+
+  const paths: Record<string, string[]> = {};
+  for (const t of tracks.filter((t) => t.inLibrary)) {
+    paths[t.mbid] = [`/music/${t.mbid}.mp3`];
+  }
+
+  stub('library.Library.GetFilePathsByRecordingMBIDs', paths);
+
   const version: Version = {
     key: 'v1',
     label: '2019',
     sublabel: `${total} tracks`,
-    tracks: Array.from({ length: total }, (_, i) => track(i + 1, i < owned)),
+    tracks,
   };
 
   Object.assign(el, {
@@ -125,23 +140,28 @@ describe('the album header’s primary action', () => {
     expect(shadow(el, '[data-testid="album-queue"]')).toBeNull();
   });
 
-  it('asks for the owned tracks’ paths once, by the key it owns them by', async () => {
-    // `perf.m2`'s rule: ask for what the caller uses, once. The caller
-    // here uses file paths and knows its tracks only as recording
-    // MBIDs — `MBTrack.localId` is declared and never written by
-    // anything in the backend.
+  it('asks for the tracklist’s paths once, on load, and not on click', async () => {
+    // `perf.m2`'s rule — ask for what the caller uses, once — and the
+    // ownership rule with it. The page asks about the *whole* displayed
+    // tracklist when it settles, because whether a track is owned is
+    // that query's answer and not something to be inferred first. Every
+    // action, badge and dimmed row then reads the one result, so a
+    // click asks nothing and cannot fail.
     const el = await withVersion(7, 12);
 
+    const onLoad = calls('library.Library.GetFilePathsByRecordingMBIDs');
+
+    expect(onLoad).toHaveLength(1);
+    expect(onLoad[0]!.args[0]).toHaveLength(12);
+    // No empty MBID — an empty string matches every untagged recording
+    // in the library.
+    expect(onLoad[0]!.args[0]).not.toContain('');
+
     shadow<HTMLElement>(el, '[data-testid="album-play"]')!.click();
     await flush();
 
-    const asked = calls('library.Library.GetFilePathsByRecordingMBIDs');
-
-    expect(asked).toHaveLength(1);
-    // Only the owned ones, and no empty MBID — an empty string matches
-    // every untagged recording in the library.
-    expect(asked[0]!.args[0]).toHaveLength(7);
-    expect(asked[0]!.args[0]).not.toContain('');
+    expect(calls('library.Library.GetFilePathsByRecordingMBIDs')).toHaveLength(1);
+    expect(lastArgs('queue.Queue.SetQueue')?.[0]).toHaveLength(7);
   });
 });
 

frontend/test/components/album-catalog-scope.test.ts

@@ -164,8 +164,17 @@ describe('an album the library already holds in full', () => {
     stub('explore.Service.GetThumbnail', '');
     stub('library.Library.GetAllLibrariesWithTrackCounts', []);
     stub('library.Library.GetFilePathsByRecordingMBIDs', {});
+    // A local album's rows carry their file paths, and that is what
+    // "the library holds this" means now — the page records them as it
+    // maps the tracks, so nothing has to be asked again later.
     stub('library.Library.GetAlbumTracks', [
-      { TrackName: 'Track 1', TrackNumber: 1, DiscNumber: 1, TrackLength: '3:20' },
+      {
+        TrackName: 'Track 1',
+        TrackNumber: 1,
+        DiscNumber: 1,
+        TrackLength: '3:20',
+        FilePath: '/music/glass-harbour/01.mp3',
+      },
     ]);
   });
 
@@ -253,4 +262,72 @@ describe('an album the library already holds in full', () => {
     const badge = shadow(el, 'library-status-indicator');
     expect(badge?.getAttribute('status')).toBe('partial');
   });
+
+  /**
+   * The denominator the files could not supply.
+   *
+   * A great deal of any library declares no track total at all, and
+   * "unknown" is a third state that must render as neither complete nor
+   * incomplete — so an album like this used to wear a plain tick no
+   * matter how much of it was missing. The catalog carries a per-
+   * release-group total in the artifact for about two bytes a row, and
+   * that is what fills the gap: the numerator stays local (how many
+   * distinct track numbers are on disk), only the denominator is
+   * borrowed.
+   */
+  it('borrows the catalog total when the tags declared none', async () => {
+    stub('explore.Service.LookupReleaseGroup', {
+      mbid: MBID,
+      title: 'Glass Harbour',
+      artistCredit: 'Tideline',
+      totalTracks: 12,
+    });
+    stub('library.Library.GetAlbumCompleteness', {
+      owned: 9,
+      expected: 0,
+      known: false,
+      complete: false,
+    });
+
+    const el = await fixture<LitElement>('explore-album-details', {
+      releaseGroupMBID: MBID,
+      localAlbumId: 7,
+      albumName: 'Glass Harbour',
+    });
+
+    await flush();
+    await el.updateComplete;
+
+    const badge = shadow(el, 'library-status-indicator');
+    expect(badge?.getAttribute('status')).toBe('partial');
+    expect((badge as unknown as { expected: number }).expected).toBe(12);
+    expect((badge as unknown as { owned: number }).owned).toBe(9);
+  });
+
+  /**
+   * And when neither side can total it, nothing is invented: zero means
+   * "the catalog does not say", which is the same third state the local
+   * answer has, so the badge stays a plain tick.
+   */
+  it('draws no ring when neither the tags nor the catalog say', async () => {
+    stub('library.Library.GetAlbumCompleteness', {
+      owned: 9,
+      expected: 0,
+      known: false,
+      complete: false,
+    });
+
+    const el = await fixture<LitElement>('explore-album-details', {
+      releaseGroupMBID: MBID,
+      localAlbumId: 7,
+      albumName: 'Glass Harbour',
+    });
+
+    await flush();
+    await el.updateComplete;
+
+    expect(
+      shadow(el, 'library-status-indicator')?.getAttribute('status'),
+    ).toBe('in-library');
+  });
 });

frontend/test/components/album-dropdown.test.ts

@@ -81,10 +81,10 @@ async function expandFirstCard(el: LitElement): Promise<void> {
 describe('the album dropdown', () => {
   beforeEach(() => {
     resetHarness();
-    stub('library.Library.GetAllAlbums', ALBUMS);
-    stub('library.Library.GetAllTracks', []);
+    stub('library.Library.GetAlbums', ALBUMS);
+    stub('library.Library.GetTracks', []);
+    stub('library.Library.GetAlbumTracks', TRACKS);
     stub('library.Library.GetAlbumTracks', TRACKS);
-    stub('library.Library.GetAlbumTracksByLibrary', TRACKS);
     emit(Events.LibraryScanComplete);
   });
 
@@ -154,8 +154,8 @@ describe('the album dropdown', () => {
 describe('the albums grid scrolls', () => {
   beforeEach(() => {
     resetHarness();
-    stub('library.Library.GetAllAlbums', ALBUMS);
-    stub('library.Library.GetAllTracks', []);
+    stub('library.Library.GetAlbums', ALBUMS);
+    stub('library.Library.GetTracks', []);
     emit(Events.LibraryScanComplete);
   });
 

frontend/test/components/album-versions.test.ts

@@ -210,6 +210,17 @@ describe('an album the library holds part of', () => {
   });
 
   it('draws the whole release, with the missing tracks dimmed', async () => {
+    // Ownership is a *file*, not the catalog row's `inLibrary` flag —
+    // nine of the twelve recordings resolve to a path, so three rows
+    // dim.  Stating it as flags is what let the page claim an album it
+    // could not play a note of.
+    stub(
+      'library.Library.GetFilePathsByRecordingMBIDs',
+      Object.fromEntries(
+        Array.from({ length: 9 }, (_, i) => [`rec-${i + 1}`, [`/music/0${i + 1}.mp3`]]),
+      ),
+    );
+
     const el = await albumWith(
       [release('rel-1', '2019-04-01', 12, 9)],
       { owned: 9, expected: 12, known: true, complete: false },

frontend/test/components/aria-tail.test.ts

@@ -76,8 +76,8 @@ describe('the track list says how it is sorted', () => {
   beforeEach(async () => {
     resetHarness();
     searchStore.setTerm('');
-    stub('library.Library.GetAllTracks', TRACKS);
-    stub('library.Library.GetAllAlbums', []);
+    stub('library.Library.GetTracks', TRACKS);
+    stub('library.Library.GetAlbums', []);
     emit(Events.LibraryScanComplete);
   });
 
@@ -128,11 +128,11 @@ describe('the track list has a voice for its own state', () => {
   beforeEach(() => {
     resetHarness();
     searchStore.setTerm('');
-    stub('library.Library.GetAllAlbums', []);
+    stub('library.Library.GetAlbums', []);
   });
 
   it('announces the result of a search that matches nothing', async () => {
-    stub('library.Library.GetAllTracks', TRACKS);
+    stub('library.Library.GetTracks', TRACKS);
     emit(Events.LibraryScanComplete);
 
     const el = await fixture<LitElement>('track-list');
@@ -161,10 +161,10 @@ describe('a selectable grid is a listbox, not a row of buttons', () => {
   beforeEach(() => {
     resetHarness();
     searchStore.setTerm('');
-    stub('library.Library.GetAllArtists', ARTISTS);
-    stub('library.Library.GetAllGenresWithCounts', GENRES);
-    stub('library.Library.GetAllTracks', []);
-    stub('library.Library.GetAllAlbums', []);
+    stub('library.Library.GetArtists', ARTISTS);
+    stub('library.Library.GetGenres', GENRES);
+    stub('library.Library.GetTracks', []);
+    stub('library.Library.GetAlbums', []);
     emit(Events.LibraryScanComplete);
   });
 
@@ -197,8 +197,8 @@ describe('a clipped value is readable somewhere', () => {
   beforeEach(async () => {
     resetHarness();
     searchStore.setTerm('');
-    stub('library.Library.GetAllTracks', TRACKS);
-    stub('library.Library.GetAllAlbums', []);
+    stub('library.Library.GetTracks', TRACKS);
+    stub('library.Library.GetAlbums', []);
     emit(Events.LibraryScanComplete);
   });
 
@@ -240,8 +240,8 @@ describe('the playing row is more than a colour', () => {
   beforeEach(async () => {
     resetHarness();
     searchStore.setTerm('');
-    stub('library.Library.GetAllTracks', TRACKS);
-    stub('library.Library.GetAllAlbums', []);
+    stub('library.Library.GetTracks', TRACKS);
+    stub('library.Library.GetAlbums', []);
     emit(Events.LibraryScanComplete);
   });
 

frontend/test/components/card-grid-repaint.test.ts

@@ -56,10 +56,10 @@ async function settle(el: LitElement): Promise<void> {
 describe('a card grid shows its selection', () => {
   beforeEach(() => {
     resetHarness();
-    stub('library.Library.GetAllArtists', ARTISTS);
-    stub('library.Library.GetAllGenresWithCounts', GENRES);
-    stub('library.Library.GetAllTracks', []);
-    stub('library.Library.GetAllAlbums', []);
+    stub('library.Library.GetArtists', ARTISTS);
+    stub('library.Library.GetGenres', GENRES);
+    stub('library.Library.GetTracks', []);
+    stub('library.Library.GetAlbums', []);
     // The views read through LibraryController, whose cache is only
     // primed by a scan-complete; without it they render nothing and the
     // assertion below fails for the wrong reason.

frontend/test/components/chrome.test.ts

@@ -128,7 +128,7 @@ describe('<library-filter>', () => {
     select?.dispatchEvent(new Event('change'));
     await flush();
 
-    expect(lastArgs('library.Library.GetAllTracksByLibrary')).toEqual([8]);
+    expect(lastArgs('library.Library.GetTracks')).toEqual([8]);
   });
 
   it('picks up a library added while it was on screen', async () => {

frontend/test/components/empty-states.test.ts

@@ -15,10 +15,10 @@ import { fixture, shadow, text } from '@test/support/render';
 /** Drop the library store's cache so the list has to fetch. */
 async function emptyLibrary(): Promise<void> {
   resetHarness();
-  stub('library.Library.GetAllTracks', []);
-  stub('library.Library.GetAllAlbums', []);
-  stub('library.Library.GetAllArtists', []);
-  stub('library.Library.GetAllGenresWithCounts', []);
+  stub('library.Library.GetTracks', []);
+  stub('library.Library.GetAlbums', []);
+  stub('library.Library.GetArtists', []);
+  stub('library.Library.GetGenres', []);
   emit(Events.LibraryScanComplete);
   await flush();
 }
@@ -40,7 +40,7 @@ describe('<track-list> empty, loading and failed', () => {
   });
 
   it('says the query failed, and offers to try again', async () => {
-    stubFailure('library.Library.GetAllTracks', 'sql: database is locked');
+    stubFailure('library.Library.GetTracks', 'sql: database is locked');
     emit(Events.LibraryScanComplete);
     await flush();
 

frontend/test/components/explore-track-details.test.ts

@@ -0,0 +1,244 @@
+/**
+ * "Track Details" and "Add to Playlist" on Explore's owned tracks.
+ *
+ * The library-side lists have had this item for as long as the dialog
+ * has existed; Explore's tracklists — the album page's and the artist
+ * page's top tracks — had Play, Add to Queue and Play Next and stopped
+ * there. The reason it is worth a test rather than being one more
+ * `<wa-dropdown-item>` is that the two sides hold different things: a
+ * library row *is* a `library.Track`, and an Explore row is the
+ * catalog's, which can name a file only through its recording MBID.
+ *
+ * So what this pins is the join. Both items appear only for a track the
+ * user owns (an unowned one has no file, and both are about a file):
+ * Track Details resolves MBID → path → the library's own track and
+ * hands *that* to the dialog, and Add to Playlist resolves the same
+ * path and hands it to the shared picker.
+ */
+import type { LitElement } from 'lit';
+import { beforeEach, describe, expect, it } from 'vitest';
+
+import '@components/explore-album-details/explore-album-details';
+import { emit, flush, stub } from '@test/support/harness';
+import { Events } from '../../src/events';
+import { fixture, shadow, shadowAll } from '@test/support/render';
+import { showTrackDetailsForPath } from '@utils/track-details-opener';
+import type { TrackDetails } from '@components/track-details/track-details';
+
+const ALBUM_TRACKS = 'library.Library.GetAlbumTracks';
+const COMPLETENESS = 'library.Library.GetAlbumCompleteness';
+const FILE_PATHS = 'library.Library.GetFilePathsByRecordingMBIDs';
+const ALL_TRACKS = 'library.Library.GetTracks';
+const LOOKUP_RG = 'explore.Service.LookupReleaseGroup';
+const BROWSE_RELEASES = 'explore.Service.BrowseReleases';
+
+const PATH = '/music/an-album/01.flac';
+const MBID = 'rec-1';
+
+/** One row as `GetAlbumTracks` returns it. */
+const albumTrack = {
+  ID: 1,
+  FilePath: PATH,
+  TrackName: 'A Song',
+  TrackNumber: 1,
+  DiscNumber: 1,
+  TrackLength: '3:00',
+  RecordingMBID: MBID,
+};
+
+/** The same track as the library's own model, which is what the dialog wants. */
+const libraryTrack = {
+  ID: 1,
+  FilePath: PATH,
+  Title: 'A Song',
+  Artist: 'An Artist',
+  Album: 'An Album',
+  CoverArtPath: '/covers/a.jpg',
+  CoverArtSmall: '/covers/a-64.jpg',
+  CoverArtMedium: '/covers/a-256.jpg',
+  CoverArtLarge: '/covers/a-512.jpg',
+};
+
+/**
+ * Mount the album page as a library-only album, which is the cheapest
+ * route to a rendered tracklist: no MBID means it hydrates entirely
+ * from `GetAlbumTracks` and asks the catalog nothing.
+ */
+async function albumPage() {
+  return fixture('explore-album-details', { localAlbumId: 7 });
+}
+
+/** Open the context menu on the first track row and return its items. */
+async function openTrackMenu(el: LitElement) {
+  const row = shadow(el, '.track-row');
+
+  expect(row, 'a track row is rendered').not.toBeNull();
+
+  row!.dispatchEvent(
+    new MouseEvent('contextmenu', { bubbles: true, cancelable: true }),
+  );
+  await flush();
+  await el.updateComplete;
+
+  return shadowAll(el, '.context-menu-panel wa-dropdown-item');
+}
+
+/** The track the page's `<track-details>` was opened on, once it has one. */
+async function dialogTrack(
+  el: LitElement,
+  attempts = 100,
+): Promise<{ FilePath: string } | null> {
+  for (let i = 0; i < attempts; i += 1) {
+    const dialog = shadow<TrackDetails>(el, 'track-details') as unknown as {
+      track?: { FilePath: string } | null;
+    } | null;
+
+    if (dialog?.track) return dialog.track;
+
+    await flush();
+  }
+
+  return null;
+}
+
+/** The file paths handed to the playlist picker, once it is mounted. */
+async function pickerPaths(
+  el: LitElement,
+  attempts = 100,
+): Promise<string[] | null> {
+  for (let i = 0; i < attempts; i += 1) {
+    const picker = shadow(el, 'playlist-picker') as unknown as {
+      filePaths?: string[];
+    } | null;
+
+    if (picker?.filePaths?.length) return picker.filePaths;
+
+    await flush();
+  }
+
+  return null;
+}
+
+const labels = (items: Element[]) =>
+  items.map((i) => (i.textContent ?? '').trim());
+
+describe('Explore track details', () => {
+  beforeEach(() => {
+    stub(ALBUM_TRACKS, [albumTrack]);
+    stub(COMPLETENESS, { known: true, complete: true, owned: 1, expected: 1 });
+    stub(FILE_PATHS, { [MBID]: [PATH] });
+    stub(ALL_TRACKS, [libraryTrack]);
+  });
+
+  /**
+   * `libraryStore` fetches at import and caches the empty list the
+   * shared setup stubs, for the life of the browser session — so a test
+   * that wants tracks in it has to say so. A scan-complete event is how
+   * the app itself invalidates that cache.
+   */
+  async function primeLibrary() {
+    emit(Events.LibraryScanComplete);
+    await flush();
+  }
+
+  it('offers Track Details on an owned track', async () => {
+    const el = await albumPage();
+    const items = await openTrackMenu(el);
+
+    expect(labels(items)).toContain('Track Details');
+  });
+
+  it('does not offer it on a track the library does not have', async () => {
+    // A catalog album the user owns nothing of: the tracklist renders
+    // from the browse, and every row is unowned.
+    stub(ALBUM_TRACKS, []);
+    stub(LOOKUP_RG, {
+      mbid: 'rg-1',
+      title: 'An Album',
+      artistCredit: 'An Artist',
+      firstReleaseDate: '1994',
+      primaryType: 'Album',
+    });
+    stub(BROWSE_RELEASES, [
+      {
+        mbid: 'rel-1',
+        title: 'An Album',
+        date: '1994',
+        country: 'GB',
+        tracks: [
+          {
+            mbid: 'rec-2',
+            title: 'Another Song',
+            position: 1,
+            length: 180000,
+            discNumber: 1,
+            inLibrary: false,
+          },
+        ],
+      },
+    ]);
+
+    const el = await fixture<LitElement>('explore-album-details', {
+      releaseGroupMBID: 'rg-1',
+    });
+    const items = await openTrackMenu(el);
+
+    expect(labels(items)).not.toContain('Track Details');
+    expect(
+      labels(items).some((l) => l.startsWith('Add to Playlist')),
+      'nothing to add to a playlist when there is no file',
+    ).toBe(false);
+    // The one item a track nobody owns still has, which is what makes
+    // the assertion above about the gate rather than about an empty
+    // menu that never opened.
+    expect(labels(items)).toContain('View on MusicBrainz');
+  });
+
+  it('opens the dialog on the library track behind the row', async () => {
+    await primeLibrary();
+
+    const el = await albumPage();
+    const items = await openTrackMenu(el);
+    const details = labels(items).indexOf('Track Details');
+
+    items[details]!.dispatchEvent(new MouseEvent('click', { bubbles: true }));
+
+    // Polled rather than counted: the opener is three awaits deep — the
+    // path lookup, the store's tracks, and the dynamic `import()` of
+    // the dialog chunk — and a chunk fetch is the one of the three
+    // whose cost depends on what else the suite is doing.
+    const shown = await dialogTrack(el);
+
+    expect(shown?.FilePath).toBe(PATH);
+  });
+
+  it('opens the playlist submenu on the row’s own file', async () => {
+    const el = await albumPage();
+    const items = await openTrackMenu(el);
+    // Its label carries the submenu arrow, so match the prefix.
+    const add = labels(items).findIndex((l) => l.startsWith('Add to Playlist'));
+
+    expect(add, 'the submenu item is in the menu').toBeGreaterThan(-1);
+
+    items[add]!.dispatchEvent(new MouseEvent('click', { bubbles: true }));
+
+    // Resolved by MBID at the moment the submenu opens, so the picker
+    // is not there on the first tick the way a library list's is.
+    const picker = await pickerPaths(el);
+
+    expect(picker).toEqual([PATH]);
+  });
+
+  it('reports a path with no library track rather than opening empty', async () => {
+    stub(ALL_TRACKS, []);
+    await primeLibrary();
+
+    const outcome = await showTrackDetailsForPath(
+      () => undefined,
+      PATH,
+      () => undefined,
+    );
+
+    expect(outcome).toBe('not-in-library');
+  });
+});

frontend/test/components/home-view.test.ts

@@ -132,7 +132,7 @@ describe('home view', () => {
     await new Promise((r) => setTimeout(r, 0));
 
     expect(seen).toEqual([]);
-    expect(lastArgs('library.Library.GetAlbumTracks')).toEqual([1]);
+    expect(lastArgs('library.Library.GetAlbumTracks')).toEqual([1, 0]);
     expect(lastArgs('queue.Queue.SetQueue')).toEqual([
       ['/music/1.mp3', '/music/2.mp3'],
       0,

frontend/test/components/keyboard-reach.test.ts

@@ -67,7 +67,7 @@ describe('<queue-panel> when closed', () => {
 
 describe('<track-list> roving tabindex', () => {
   beforeEach(() => {
-    stub('library.Library.GetAllTracks', TRACKS);
+    stub('library.Library.GetTracks', TRACKS);
   });
 
   it('offers exactly one tab stop, however many rows there are', async () => {

frontend/test/components/library-status.test.ts

@@ -132,8 +132,8 @@ describe('<explore-view> badges', () => {
     stub('explore.Service.GetThumbnail', '');
     stub('explore.Service.GetArtistImageURL', '');
     stub('explore.Service.GetExploreShelves', { shelves: [], state: 'ready' });
-    stub('library.Library.GetAllAlbums', []);
-    stub('library.Library.GetAllTracks', []);
+    stub('library.Library.GetAlbums', []);
+    stub('library.Library.GetTracks', []);
     await withRequests([]);
   });
 

frontend/test/components/phantom-resolver.test.ts

@@ -0,0 +1,201 @@
+/**
+ * The phantom resolver showed the same library track twice.
+ *
+ * Its right-hand panel renders two lists one under the other — the
+ * scored candidates and the library search results — and a search for
+ * the obvious title returns exactly what scoring already found. So the
+ * track appeared once with a score and once without, and double-clicking
+ * either did the same thing.
+ *
+ * The second half is what a match *means*: one library file cannot stand
+ * in for two unmatched tracks, or applying adds it to the playlist
+ * twice. `FindPhantomMatches` has always claimed candidates on the
+ * auto-match path; the manual path had no such rule.
+ */
+import { beforeEach, describe, expect, it } from 'vitest';
+import type { LitElement } from 'lit';
+
+import '@components/phantom-resolver/phantom-resolver';
+import { flush, stub } from '@test/support/harness';
+import { fixture } from '@test/support/render';
+
+interface Candidate {
+  FilePath: string;
+  Title: string;
+  Artist: string;
+  Album: string;
+  Duration: string;
+  Score: number;
+}
+
+function candidate(
+  path: string,
+  title: string,
+  score = 0.5,
+): Candidate {
+  return {
+    FilePath: path,
+    Title: title,
+    Artist: 'An Artist',
+    Album: 'An Album',
+    Duration: '200000',
+    Score: score,
+  };
+}
+
+const PHANTOM_A = '/music/gone/one.mp3';
+const PHANTOM_B = '/music/gone/two.mp3';
+
+/** Mount the dialog with two unmatched tracks and no auto-matches. */
+async function open(
+  candidates: Candidate[],
+  searchResults: Candidate[] = [],
+): Promise<HTMLElement & { updateComplete: Promise<unknown> }> {
+  stub('playlist.Service.FindPhantomMatches', {
+    AutoMatched: [],
+    Unmatched: [PHANTOM_A, PHANTOM_B],
+  });
+  stub('playlist.Service.GetPhantomCandidates', candidates);
+  stub('playlist.Service.SearchLibrary', searchResults);
+
+  const el = await fixture<
+    LitElement & { show(id: number, tracks: unknown[]): void }
+  >('phantom-resolver');
+
+  el.show(1, [
+    { FilePath: PHANTOM_A, Title: 'One', Phantom: true },
+    { FilePath: PHANTOM_B, Title: 'Two', Phantom: true },
+  ]);
+
+  await flush();
+  await el.updateComplete;
+  await flush();
+  await el.updateComplete;
+
+  return el;
+}
+
+function candidateRows(el: HTMLElement): HTMLElement[] {
+  return [
+    ...(el.shadowRoot?.querySelectorAll<HTMLElement>('.candidate-item') ?? []),
+  ];
+}
+
+/** The dialog renders the file path as each row's `title`. */
+function rowPaths(el: HTMLElement): string[] {
+  return candidateRows(el).map((r) => r.getAttribute('title') ?? '');
+}
+
+describe('the phantom resolver', () => {
+  beforeEach(() => {
+    stub('playlist.Service.ResolvePhantomTracks', null);
+    stub('playlist.Service.RemovePhantomTracks', null);
+  });
+
+  it('lists a search result the candidates already show only once', async () => {
+    const shared = candidate('/music/have/one.mp3', 'One', 0.7);
+    const el = await open([shared], [shared, candidate('/music/have/x.mp3', 'X', 0)]);
+
+    // Type into the search box and let the debounce fire.
+    const input = el.shadowRoot?.querySelector<HTMLInputElement>(
+      '.search-input',
+    );
+
+    expect(input, 'the search box is rendered').toBeTruthy();
+
+    input!.value = 'one';
+    input!.dispatchEvent(new InputEvent('input', { bubbles: true }));
+
+    await new Promise((r) => setTimeout(r, 500));
+    await flush();
+    await el.updateComplete;
+
+    const paths = rowPaths(el);
+
+    expect(paths.filter((p) => p === shared.FilePath)).toHaveLength(1);
+    expect(paths).toContain('/music/have/x.mp3');
+  });
+
+  it('matches a candidate from the keyboard, not only a double-click', async () => {
+    const el = await open([candidate('/music/have/one.mp3', 'One', 0.7)]);
+    const row = candidateRows(el)[0];
+
+    expect(row, 'a candidate row is rendered').toBeTruthy();
+    expect(row!.getAttribute('role')).toBe('button');
+    expect(row!.getAttribute('tabindex')).toBe('0');
+
+    row!.dispatchEvent(
+      new KeyboardEvent('keydown', { key: 'Enter', bubbles: true }),
+    );
+    await el.updateComplete;
+
+    // Matching the first phantom advances to the second, whose row
+    // shows the check mark for the one just confirmed.
+    const matched = el.shadowRoot?.querySelectorAll('.phantom-item.matched');
+
+    expect(matched).toHaveLength(1);
+  });
+
+  it('will not spend one library file on two unmatched tracks', async () => {
+    const only = candidate('/music/have/one.mp3', 'One', 0.7);
+    const el = await open([only]);
+
+    candidateRows(el)[0]!.dispatchEvent(
+      new KeyboardEvent('keydown', { key: 'Enter', bubbles: true }),
+    );
+    await el.updateComplete;
+    await flush();
+    await el.updateComplete;
+
+    // The second phantom is selected now and offered the same file,
+    // which is already standing in for the first.
+    const row = candidateRows(el)[0];
+
+    expect(row!.classList.contains('claimed')).toBe(true);
+    expect(row!.getAttribute('aria-disabled')).toBe('true');
+
+    row!.dispatchEvent(
+      new KeyboardEvent('keydown', { key: 'Enter', bubbles: true }),
+    );
+    await el.updateComplete;
+
+    // Still one confirmed match, not two.
+    expect(
+      el.shadowRoot?.querySelectorAll('.phantom-item.matched'),
+    ).toHaveLength(1);
+  });
+
+  it('gives the auto-match disclosure a keyboard-reachable control', async () => {
+    stub('playlist.Service.FindPhantomMatches', {
+      AutoMatched: [
+        {
+          PhantomPath: PHANTOM_A,
+          PhantomTitle: 'One',
+          Candidate: candidate('/music/have/one.mp3', 'One', 0.95),
+        },
+      ],
+      Unmatched: [PHANTOM_B],
+    });
+    stub('playlist.Service.GetPhantomCandidates', []);
+
+    const el = await fixture<
+      LitElement & { show(id: number, tracks: unknown[]): void }
+    >('phantom-resolver');
+
+    el.show(1, [{ FilePath: PHANTOM_A, Title: 'One', Phantom: true }]);
+    await flush();
+    await el.updateComplete;
+
+    const header = el.shadowRoot?.querySelector('.auto-match-header');
+
+    expect(header?.tagName).toBe('BUTTON');
+    expect(header?.getAttribute('aria-expanded')).toBe('false');
+
+    // aria-controls has to name an element that is in the DOM, so the
+    // list renders collapsed rather than not at all.
+    const controls = header?.getAttribute('aria-controls');
+
+    expect(controls).toBeTruthy();
+    expect(el.shadowRoot?.getElementById(controls!)).toBeTruthy();
+  });
+});

frontend/test/components/play-in-context.test.ts

@@ -0,0 +1,271 @@
+/**
+ * Playing a track plays the list it is in.
+ *
+ * Double-clicking a row — or picking Play from its context menu — used
+ * to call `SetQueue([thatOnePath], 0)` on the album page, in the track
+ * list and in the two playlist views' menus: the queue became one
+ * track, the rest of the album was discarded, and playback stopped at
+ * the end of it. What a player means by activating a row is "start
+ * here", and the here is a position in the list on screen.
+ *
+ * So the queue is the *displayed* list and `startIndex` is the row.
+ * Two rules ride along and are what these tests are mostly for:
+ *
+ * - The album page's list is the tracks it has files for, so the index
+ *   is into that and not into the tracklist that includes the dimmed
+ *   rows — off-by-however-many-you-do-not-own is silent, it just plays
+ *   the wrong song.
+ * - A menu asks how much is selected. One row means "from here"; an
+ *   explicit multi-row selection means play exactly those, which is
+ *   the one case where a queue of the selection is what was asked for.
+ */
+import { describe, expect, it, beforeEach } from 'vitest';
+import type { LitElement } from 'lit';
+
+import '@components/explore-album-details/explore-album-details';
+import '@components/track-list/track-list';
+import '@components/playlist-details/playlist-details';
+import { stub, flush, resetHarness, lastArgs } from '@test/support/harness';
+import { fixture, shadowAll } from '@test/support/render';
+
+/** What `Queue.SetQueue` was last asked to play, and from where. */
+function queued(): { paths: string[]; startIndex: number } {
+  const args = lastArgs('queue.Queue.SetQueue');
+
+  if (!args) throw new Error('nothing was queued');
+
+  return {
+    paths: args[0] as string[],
+    startIndex: args[1] as number,
+  };
+}
+
+function dblclick(el: Element): void {
+  el.dispatchEvent(
+    new MouseEvent('dblclick', { bubbles: true, composed: true }),
+  );
+}
+
+// =====================================================================
+// The album page
+// =====================================================================
+
+function albumTrack(n: number, owned: boolean) {
+  return {
+    position: n,
+    discNumber: 1,
+    title: `Track ${n}`,
+    length: 200000,
+    mbid: `mbid-${n}`,
+    inLibrary: owned,
+  };
+}
+
+/**
+ * A release on the page without the network, owned every `nth` track.
+ * The fixture says which tracks have *files*, because that is the one
+ * question the page asks about ownership.
+ */
+async function album(total: number, ownedMbids: string[]): Promise<LitElement> {
+  const el = await fixture<LitElement>('explore-album-details', {
+    albumName: 'Glass Harbour',
+  });
+
+  const tracks = Array.from({ length: total }, (_, i) =>
+    albumTrack(i + 1, ownedMbids.includes(`mbid-${i + 1}`)),
+  );
+
+  const paths: Record<string, string[]> = {};
+  for (const mbid of ownedMbids) paths[mbid] = [`/music/${mbid}.mp3`];
+
+  stub('library.Library.GetFilePathsByRecordingMBIDs', paths);
+
+  Object.assign(el, {
+    versionEntries: [
+      { key: 'v1', label: '2019', sublabel: `${total} tracks`, tracks },
+    ],
+    selectedVersionKey: 'v1',
+    loadingReleases: false,
+    loadingInfo: false,
+  });
+  el.requestUpdate();
+  await flush();
+  await el.updateComplete;
+
+  return el;
+}
+
+describe('double-clicking a track on the album page', () => {
+  beforeEach(() => {
+    resetHarness();
+    stub('library.Library.GetFilePathsByAlbums', {});
+    stub('library.Library.GetAlbumTracks', []);
+    stub('library.Library.GetAllLibrariesWithTrackCounts', []);
+  });
+
+  it('queues the album and starts on that track', async () => {
+    const el = await album(6, ['mbid-1', 'mbid-2', 'mbid-3', 'mbid-4', 'mbid-5', 'mbid-6']);
+
+    dblclick(shadowAll(el, '.track-row')[2]!);
+    await flush();
+
+    expect(queued()).toEqual({
+      paths: [1, 2, 3, 4, 5, 6].map((n) => `/music/mbid-${n}.mp3`),
+      startIndex: 2,
+    });
+  });
+
+  it('indexes into what is owned, not into the rows on screen', async () => {
+    // Tracks 2, 5 and 6 have files; the other three rows are dimmed and
+    // are not in the queue at all. Row 5 is therefore the *second*
+    // thing that will play, and an index taken from the row would start
+    // this album past its end.
+    const el = await album(6, ['mbid-2', 'mbid-5', 'mbid-6']);
+
+    dblclick(shadowAll(el, '.track-row')[4]!);
+    await flush();
+
+    expect(queued()).toEqual({
+      paths: ['/music/mbid-2.mp3', '/music/mbid-5.mp3', '/music/mbid-6.mp3'],
+      startIndex: 1,
+    });
+  });
+
+  it('does nothing at all on a row with no file behind it', async () => {
+    const el = await album(6, ['mbid-2']);
+
+    dblclick(shadowAll(el, '.track-row')[0]!);
+    await flush();
+
+    expect(lastArgs('queue.Queue.SetQueue')).toBeUndefined();
+  });
+});
+
+// =====================================================================
+// The track list
+// =====================================================================
+
+const LIST = Array.from({ length: 12 }, (_, i) => ({
+  FilePath: `/music/track-${i}.mp3`,
+  TrackName: `Track ${i}`,
+  ArtistName: 'An Artist',
+  Album: 'An Album',
+  Duration: 180,
+})) as never[];
+
+describe('double-clicking a row in the track list', () => {
+  let el: LitElement;
+
+  beforeEach(async () => {
+    resetHarness();
+    localStorage.removeItem('track-list-column-widths');
+
+    el = await fixture<LitElement>('track-list', { externalTracks: LIST });
+    el.style.display = 'block';
+    el.style.height = '600px';
+    await flush();
+    await el.updateComplete;
+    await new Promise((r) => setTimeout(r, 60));
+  });
+
+  it('queues the list as displayed and starts on that row', async () => {
+    const rows = shadowAll(el, '.track-row');
+    const row = rows.find((r) => r.getAttribute('data-index') === '3');
+
+    dblclick(row!);
+    await flush();
+
+    const { paths, startIndex } = queued();
+
+    expect([paths.length, paths[startIndex]]).toEqual([
+      12,
+      '/music/track-3.mp3',
+    ]);
+  });
+});
+
+// =====================================================================
+// A playlist's context menu
+// =====================================================================
+
+function playlistTracks(n: number) {
+  return Array.from({ length: n }, (_, i) => ({
+    ID: i + 1,
+    FilePath: `/music/track-${i}.mp3`,
+    Title: `Track ${i}`,
+    Artist: 'An Artist',
+    Album: 'An Album',
+    Duration: 180000,
+    Phantom: false,
+  }));
+}
+
+describe('Play from a playlist row’s context menu', () => {
+  let el: LitElement;
+
+  beforeEach(async () => {
+    resetHarness();
+    stub('playlist.Service.GetPlaylistTracks', playlistTracks(8));
+    stub('playlist.Service.GetAllPlaylists', []);
+
+    el = await fixture<LitElement>('playlist-details', {
+      playlistId: 1,
+      playlistName: 'A playlist',
+    });
+    el.style.display = 'block';
+    el.style.height = '600px';
+    await flush();
+    await el.updateComplete;
+    await new Promise((r) => setTimeout(r, 60));
+  });
+
+  /** Right-click a row, then click the menu's Play item. */
+  async function playFromMenu(index: number): Promise<void> {
+    const row = shadowAll(el, '.track-item').find(
+      (r) => r.getAttribute('data-index') === String(index),
+    );
+
+    row!.dispatchEvent(
+      new MouseEvent('contextmenu', { bubbles: true, composed: true }),
+    );
+    await el.updateComplete;
+
+    const items = shadowAll<HTMLElement>(el, 'wa-dropdown-item');
+    const play = items.find((i) => i.textContent?.trim().startsWith('Play') &&
+      !i.textContent.includes('Next'));
+
+    play!.click();
+    await flush();
+  }
+
+  it('starts the playlist from the row that was clicked', async () => {
+    await playFromMenu(5);
+
+    const { paths, startIndex } = queued();
+
+    expect([paths.length, startIndex]).toEqual([8, 5]);
+  });
+
+  it('plays only the selection when several rows are selected', async () => {
+    // The one case where a queue of the selection is what was asked
+    // for: the user said which tracks, not where to start.
+    const rows = shadowAll(el, '.track-item');
+    const click = (i: number, modifiers: MouseEventInit) =>
+      rows
+        .find((r) => r.getAttribute('data-index') === String(i))!
+        .dispatchEvent(
+          new MouseEvent('click', { bubbles: true, composed: true, ...modifiers }),
+        );
+
+    click(1, {});
+    click(4, { ctrlKey: true });
+    await el.updateComplete;
+
+    await playFromMenu(4);
+
+    expect(queued().paths).toEqual([
+      '/music/track-1.mp3',
+      '/music/track-4.mp3',
+    ]);
+  });
+});

frontend/test/components/smoke.test.ts

@@ -117,10 +117,10 @@ const TAGS = [
  */
 function stubEmptyBackend(): void {
   const emptyLists = [
-    'library.Library.GetAllTracks',
-    'library.Library.GetAllAlbums',
-    'library.Library.GetAllArtists',
-    'library.Library.GetAllGenresWithCounts',
+    'library.Library.GetTracks',
+    'library.Library.GetAlbums',
+    'library.Library.GetArtists',
+    'library.Library.GetGenres',
     'library.Library.GetAllLibrariesWithTrackCounts',
     'playlist.Service.GetAllPlaylists',
     'playlist.Service.GetAllPlaylistsWithTracks',

frontend/test/components/view-lifecycle.test.ts

@@ -233,10 +233,10 @@ const CACHED_VIEWS = [
  *  binding resolves undefined, which is not what Go sends. */
 function stubEmptyBackend(): void {
   for (const path of [
-    'library.Library.GetAllTracks',
-    'library.Library.GetAllAlbums',
-    'library.Library.GetAllArtists',
-    'library.Library.GetAllGenresWithCounts',
+    'library.Library.GetTracks',
+    'library.Library.GetAlbums',
+    'library.Library.GetArtists',
+    'library.Library.GetGenres',
     'library.Library.GetAllLibrariesWithTrackCounts',
     'playlist.Service.GetAllPlaylists',
     'playlist.Service.GetAllPlaylistsWithTracks',