feat(web): add search query helpers (summary + 3 facet infinite queries)

createSearchQuery hits /api/search with limit=10 (the main /search
page summary). createSearchArtistsInfiniteQuery /
createSearchAlbumsInfiniteQuery / createSearchTracksInfiniteQuery each
hit /api/search with limit=50 and project to their own facet, used by
the per-facet overflow pages. All four are gated by q.length > 0 so
empty queries don't fire.

web/src/lib/api/queries.test.ts

@@ -15,3 +15,18 @@ describe('qk key generators', () => {
     expect(qk.album('xyz')).toEqual(['album', 'xyz']);
   });
 });
+
+describe('qk search keys', () => {
+  test('search summary key includes q', () => {
+    expect(qk.search('foo')).toEqual(['search', { q: 'foo' }]);
+  });
+  test('searchArtists key includes q', () => {
+    expect(qk.searchArtists('foo')).toEqual(['searchArtists', { q: 'foo' }]);
+  });
+  test('searchAlbums key includes q', () => {
+    expect(qk.searchAlbums('foo')).toEqual(['searchAlbums', { q: 'foo' }]);
+  });
+  test('searchTracks key includes q', () => {
+    expect(qk.searchTracks('foo')).toEqual(['searchTracks', { q: 'foo' }]);
+  });
+});