No logo in the phone's top bar (#66)

The logo moved into the top bar beside the add-feed button (#60). On a
phone that bar is tight: the logo squeezed the search box down to a few
letters, and with no hover there its version tooltip showed nothing.
Below the phone breakpoint it is left out.

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

tests/ui/app.spec.js

@@ -470,6 +470,11 @@ test('marking an OPML subscription read covers the feeds inside it', async ({ pa
 test.describe('on a phone', () => {
   test.use({ viewport: { width: 390, height: 844 } });
 
+  test('the top bar leaves the logo out, for the search box', async ({ page }) => {
+    await expect(page.locator('#burger')).toBeVisible();
+    await expect(page.locator('#applogo')).toBeHidden();
+  });
+
   test('the feed list is reachable and an item reads full screen', async ({ page }) => {
     // The burger used to live in the player bar, which is hidden until something plays --
     // leaving no way to reach the feeds at all.