Search Currently Listening from the search box (#127)

Currently Listening's search box said "Search items…" and did nothing: loadEntries returns early
for a place with its own list. Typing now redraws the list with the search sent along, as
/api/entries already takes one, title and text, and says so when nothing in progress matches.
The keys list says / searches it too.

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

tests/ui/app.spec.js

@@ -263,6 +263,15 @@ test('Currently Listening, its own place below the Directory, resumes an episode
   await expect(row).toBeVisible({ timeout: 20_000 });
   await expect(row).toContainText('14:18 left');
 
+  // The search box looks through it, as it does a feed's items (#127).
+  await page.locator('#epSearch').fill('second');
+  await expect(row).toBeVisible();
+  await page.locator('#epSearch').fill('nothing-is-called-this');
+  await expect(row).toHaveCount(0);
+  await expect(page.locator('#listening')).toContainText('Nothing you are listening to mentions');
+  await page.locator('#epSearch').fill('');
+  await expect(row).toBeVisible();
+
   // Removing it forgets where you got to, so it is still gone on the next visit.
   await row.locator('[data-a=remove]').click();
   await expect(row).toHaveCount(0);