Default to All, move OPML into settings, dress the feed actions

Opening a feed whose episodes are all read showed an empty list, so All
leads the tabs and is the default. OPML import/export moves under
Settings -- an occasional job, not a daily control -- freeing the
sidebar. Feed actions become icon pills, with Unsubscribe pushed to the
far end and quietened; it sat beside Settings looking identical.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AdXho5tTkjFLeUXKbEjKBh

PROGRESS.md

@@ -56,6 +56,17 @@ and until now nothing set them.
 
 ---
 
+## 2026-09-10 — Defaults and chrome
+
+* **All** is the default episode filter and the first tab; Unread, Downloaded and Flagged follow.
+  Opening a feed and seeing nothing because everything in it was read is a poor first impression.
+* **OPML import/export moved into Settings**, under a Subscriptions heading, and the OPML button is
+  gone from the sidebar -- it is a thing you do once in a while, not a daily control.
+* **The feed actions are pills with icons**, and Unsubscribe is pushed to the far end in a quiet
+  style: it sat next to Settings looking exactly like it, one slip away from losing a feed.
+
+---
+
 ## 2026-09-10 — Phone layout
 
 The UI was unusable on a phone, starting with the worst of it: the ☰ button lived inside the player