refactor: every count in the web app is said by one plural(), with the viewer's thousands separator; a source guard names any hand-written copy (M505 #5642)

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

web/src/lib/components/ReacquisitionSettingsCard.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+  import { plural } from '#lib/utils/plural.js';
   import { onMount } from 'svelte';
   import {
     getReacquisitionSettings,
@@ -96,8 +97,7 @@
     {#if saved && saved.unnameable_albums > 0}
       <!-- Said outright: otherwise rows that never get wanted read as a broken feature. -->
       <p class="px-4 py-3 text-sm text-text-primary">
-        {saved.unnameable_albums}
-        {saved.unnameable_albums === 1 ? 'album has' : 'albums have'} missing files but no MusicBrainz ID,
+        {plural(saved.unnameable_albums, 'album has', 'albums have')} missing files but no MusicBrainz ID,
         so {saved.unnameable_albums === 1 ? 'it' : 'they'} can't be wanted. Tag and re-scan to fix.
       </p>
     {/if}