Phone: a Directory feed's buttons keep their 44px (#212)

The #146 rule lets icon buttons shrink so a feed header's seven fit one row at 390px. It
matched the Directory feed page's row too, where nothing sets the row's width, so the buttons
shrank to their icons: 18px wide, 44px tall.

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

CHANGELOG.md

@@ -23,6 +23,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- On a phone, the Subscribe button on a Directory feed's page is full size again, not squashed to a sliver (#212).
 - ipx sends the directory its feeds when they change, and every half hour, instead of after every scan, which was every half minute or so (#211).
 
 ## [0.12.0] - 2026-10-11