feat(library): remove a track from the library without deleting the file

RemoveFromLibrary deletes the audio_files rows the way the scan's own
orphan cleanup does and records each path in excluded_paths. The
exclusion is not an enhancement: without it the next scan finds the
file, sees no row and imports it again, so the button undoes itself.

The soft scan compares files on disk against rows in the database, so
surveyAudioFiles and countAudioFiles both take the exclusion set —
otherwise an excluded path makes the two disagree forever and queues a
full scan on every launch. Deleting a row cascades to queue_tracks, so
the removal calls the same CompactQueue hook RemoveLibrary does.

Also lands the requested badge: library-status-indicator is a button
again where it can act, utils/library-status.ts states once what owning
and wanting mean, and the long-declared queued state finally has a
producer.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UDCbcCZQepnpSQYJ6SxxZm

frontend/test/components/settings-names.test.ts

@@ -9,15 +9,20 @@
  * checkboxes. In each case a `<label>` sat right beside the control
  * with nothing associating the two.
  *
- * Two of the fixes here are about a name that exists and does not
+ * Three of the fixes here are about a name that *exists* and does not
  * identify anything, which is `a11y.32`'s complaint one page over:
- * three shortcut buttons announced themselves as "S", and thirty-six
- * column arrows as "Move up" or "Move down".
+ * three shortcut buttons announced themselves as "S", thirty-six column
+ * arrows as "Move up" or "Move down", and — `a11y.26`, the audit's own
+ * finding — Explore's search box by a placeholder that disappears the
+ * moment anyone types into it. That last one is why the finding
+ * survived four phases: a placeholder is an accname fallback, so the
+ * AX sweep reported the view clean.
  */
 import { describe, expect, it } from 'vitest';
 
 import '@components/config-page/config-field';
 import '@components/config-page/shortcut-capture';
+import '@components/explore-view/explore-view';
 import { fixture, shadow } from '@test/support/render';
 
 /** What the `<label>` in this shadow root actually points at. */
@@ -114,3 +119,20 @@ describe('a shortcut button says what it binds', () => {
       .toBe('Reset Next Track to N');
   });
 });
+
+describe('a search box is labelled by more than its placeholder', () => {
+  it('names the catalog search, which loses its placeholder on typing', async () => {
+    const el = await fixture('explore-view');
+
+    await el.updateComplete;
+
+    // `a11y.26`. A placeholder *is* an accname fallback, so this box
+    // was never unnamed and the AX sweep reported the view clean —
+    // which is why the finding survived four phases. It is a weak name:
+    // it disappears the moment the user types, and it is the only
+    // thing distinguishing catalog search from lyric search.
+    const input = shadow(el, '.search-container input');
+
+    expect(input?.getAttribute('aria-label')).toBe('Search the catalog');
+  });
+});