fix(library): poll track list while enrichment is pending

The library tracks query wasn't refetching, so a track stayed on "Identifying metadata…" until an unrelated Track-tag invalidation. Poll every 4s while any listed track is metadata_status=pending, then stop (and never while offline).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/features/library/LibraryPage.tsx

@@ -1,4 +1,4 @@
-import { useState } from 'react';
+import { useEffect, useState } from 'react';
 import { useNavigate } from 'react-router';
 import { useTranslation } from 'react-i18next';
 import {
@@ -54,8 +54,14 @@ export function LibraryPage() {
   const [search, setSearch] = useState('');
   const [debouncedSearch] = useDebounce(search, 300);
 
+  // Poll while any listed track is still being enriched, then stop. Enrichment
+  // runs asynchronously in a worker after import/upload; without this the row
+  // stays stuck on "Identifying metadata…" until something else invalidates the
+  // Track tag. Cleared to 0 once nothing is pending (and while offline).
+  const [tracksPollMs, setTracksPollMs] = useState(0);
   const tracksQuery = useGetTracksQuery(
     debouncedSearch ? { search } : undefined,
+    { pollingInterval: tracksPollMs },
   );
   const albumsQuery = useGetAlbumsQuery(
     debouncedSearch ? { search } : undefined,
@@ -73,6 +79,14 @@ export function LibraryPage() {
   const localArtists = useAppSelector(selectLocalArtists);
   const q = debouncedSearch.trim().toLowerCase();
 
+  const anyPending =
+    !offline &&
+    (tracksQuery.data?.items.some((tr) => tr.metadataStatus === 'pending') ??
+      false);
+  useEffect(() => {
+    setTracksPollMs(anyPending ? 4000 : 0);
+  }, [anyPending]);
+
   // Live server data wins; offline we fall back to the locally-composed list.
   const tracksToShow =
     tracksQuery.data?.items ??