Say nothing in an empty list or an empty reader

Asked for: "Nothing here yet — try Scan now." and "Pick an item to read it." are gone. A search
that finds nothing still says so, as the words typed are the reason.

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

tests/ui/app.spec.js

@@ -157,7 +157,7 @@ test('the three panes are there and the item text lands in the bottom one', asyn
   await page.locator('.feed', { hasText: 'Test Show' }).click();
   await expect(page.locator('#list')).toBeVisible();
   await expect(page.locator('#grab')).toBeVisible();   // the draggable divider
-  await expect(page.locator('#detail')).toContainText('Pick an item');
+  await expect(page.locator('#detail .dt')).toHaveCount(0);  // nothing picked, nothing said
 
   await page.locator('.ep', { hasText: 'First Episode' }).click();
   await expect(page.locator('#detail .dt')).toHaveText('First Episode');