feat(web): AcoustID card on Integrations — key, threshold, coverage by source (M401 #3922)

The card takes the slot of the unimplemented "MusicBrainz overrides"
placeholder. Rows:
- the on switch
- a write-only key field (the stored key is never sent back), with a
  link to register an application
- the minimum score (0.5 to 1)

Below them, recording-id coverage reads as a column: from tags, looked
up, none, and of the none how many are waiting, no match, ambiguous or
failed. There is a "Look up now" button and a folded list of the tracks
the lookup could not settle.

Off, keyless and stopped-short passes are each a visible state with the
reason (rule 164).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/routes/admin/integrations/+page.svelte

@@ -27,6 +27,7 @@
   import { errCode } from '$lib/api/errors';
   import { pushToast } from '$lib/stores/toast.svelte';
   import Modal from '$lib/components/Modal.svelte';
+  import AcoustIDCard from '$lib/components/AcoustIDCard.svelte';
   import NetworkSettingsCard from '$lib/components/NetworkSettingsCard.svelte';
   import PublicAddressCard from '$lib/components/PublicAddressCard.svelte';
   import type { LidarrConfig, LidarrTestResult } from '$lib/api/types';
@@ -549,22 +550,9 @@
     </div>
   </section>
 
-  <!-- MusicBrainz overrides — visually present, not implemented. Foreshadows
-       future integrations so the page doesn't read like Lidarr-only. -->
-  <section class="space-y-2 rounded-xl border border-border bg-surface p-5 opacity-60">
-    <div class="flex items-center justify-between">
-      <h3 class="font-display text-lg font-medium text-text-primary">
-        MusicBrainz overrides
-      </h3>
-      <span
-        class="inline-flex items-center gap-2 rounded-md border border-border px-3 py-1 text-xs text-text-muted"
-      >
-        <span class="h-1.5 w-1.5 rounded-full bg-text-muted"></span>
-        unset
-      </span>
-    </div>
-    <p class="text-sm text-text-secondary">Not yet configured.</p>
-  </section>
+  <!-- AcoustID recording-id lookup (M401). Took the place of a "MusicBrainz
+       overrides" placeholder that held the slot for a non-Lidarr integration. -->
+  <AcoustIDCard />
 
   <!-- Cover art providers -->
   <section class="space-y-4 rounded-xl border border-border bg-surface p-5">

web/src/routes/admin/integrations/integrations.test.ts

@@ -28,7 +28,12 @@ vi.mock('$lib/api/admin', () => ({
   testTagProvider: vi.fn(),
   createSMTPConfigQuery: vi.fn(),
   updateSMTPConfig: vi.fn(),
-  testSMTPConfig: vi.fn()
+  testSMTPConfig: vi.fn(),
+  // AcoustIDCard loads on mount; a never-settling read leaves it on "Loading…".
+  getAcoustID: vi.fn(() => new Promise(() => {})),
+  updateAcoustIDSettings: vi.fn(),
+  runAcoustIDLookup: vi.fn(),
+  listUnsettledAcoustID: vi.fn()
 }));
 
 import IntegrationsPage from './+page.svelte';