Studies: Finished & archived section with Archive/Restore

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

src/utils/studyFilter.test.js

@@ -52,3 +52,11 @@ test('a series can be chosen as a filter, and the search finds studies by series
   expect(filterStudies(idx, { series: '__none' }).map((e) => e.id)).toEqual(['b']);
   expect(filterStudies(idx, { query: 'advent' }).map((e) => e.id)).toEqual(['c']);
 });
+
+test('archived studies are left out unless asked for', () => {
+  const idx = [{ id: 'a', title: 'Live' }, { id: 'b', title: 'Done', archived: true }, { id: 'c', title: 'Done too', archived: true, tags: ['hope'] }];
+  expect(filterStudies(idx).map((e) => e.id)).toEqual(['a']);
+  expect(filterStudies(idx, { archived: true }).map((e) => e.id)).toEqual(['b', 'c']);
+  expect(filterStudies(idx, { archived: true, tags: ['hope'] }).map((e) => e.id)).toEqual(['c']);
+  expect(filterStudies(idx, { archived: null }).map((e) => e.id)).toEqual(['a', 'b', 'c']);
+});