Popular on this server; changelog follows Keep a Changelog; 0.3.0

- Add feed lists what other accounts subscribe to, most subscribers
  first, and subscribes you by id (GET /api/popular, POST
  /api/popular/{id}). Rows never carry a URL. Feeds from an OPML and
  anything that looks private (a login, credentials in the URL, a key
  such as auth= or token=) are never listed, and the subscribe route
  checks the id against the same list.
- CHANGELOG.md follows Keep a Changelog 1.1.0: 0.1.0 (2026-09-09, the
  CLI), 0.2.0 (2026-09-10, the web UI), 0.3.0 (2026-09-11, accounts and
  sharing). The long-form entries moved unchanged to docs/history.md.
- Cargo.toml is 0.3.0. CLAUDE.md says how to add an entry and cut a
  release.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016HdTEWQNrzyFULijigkmMn

tests/ui/fixtures/paid.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0"?>
+<rss version="2.0"><channel><title>Paid Show</title><link>http://127.0.0.1:8792/</link>
+<description>Subscribed with a key in its URL, so it must never be offered to anyone else.</description>
+<item><title>Paid Ep</title><guid>paid-1</guid><description>x</description></item>
+</channel></rss>