Add a feed without Popular; a phone shows an item's files above its notes

- The Add a feed dialog no longer lists Popular; the sidebar has it (#30).
- On a phone the files, with play and delete, come before the show notes. Below
  them, long notes buried the delete button and it looked missing on iOS (#21).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -15,6 +15,9 @@ The long form, with what was wrong before and how it was found, is in
 - A feed that fails to check gets a red ! in the feed list, and its page says why, in place of a
   pop-up per failure that everyone saw during a scan of every feed.
 - The theme is chosen in Settings only; the button beside the iPodderX name is gone.
+- Add a feed asks only for the feed; Popular and Directory in the sidebar are where you browse.
+- On a phone, an item's files, with play and delete, sit above its show notes rather than below
+  them, where long notes left them looking missing.
 
 ### Fixed