Expose exact music filters in desktop and local agent clients

apps/desktop/tests/search-state.test.mjs

@@ -1,6 +1,6 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
-import { LatestLane, AutomaticIndexGate, emptySearchState, semanticAvailable, SEMANTIC_SETTLE_MS, scopedFilters } from '../src/search-state.ts';
+import { LatestLane, AutomaticIndexGate, emptySearchState, semanticAvailable, SEMANTIC_SETTLE_MS, hasSearchInput, scopedFilters } from '../src/search-state.ts';
 const settle = () => new Promise(resolve => setImmediate(resolve));
 
 test('coalesces queued keystrokes and discards stale responses', async () => {
@@ -107,3 +107,11 @@ test('same-query scope change discards old lane output and runs latest scoped re
   assert.equal(accepted[0].filters.code_only, true);
   assert.equal(accepted[0].filters.extension, 'rs');
 });
+
+
+test('exact music fields allow metadata-only searches without general filter browsing', () => {
+  assert.equal(hasSearchInput('', scopedFilters('all', {media_artist: ' Artist '})), true);
+  assert.equal(hasSearchInput('', scopedFilters('all', {media_title: 'Song'})), true);
+  assert.equal(hasSearchInput('   ', scopedFilters('all', {media_artist: ' ', extension: 'mp3'})), false);
+  assert.equal(hasSearchInput('violin', scopedFilters('all', {})), true);
+});