Never list paid-feed services; scan on add; no "reaped"; slimmer header

- Security: feeds from Patreon, Supercast, Supporting Cast, Glow and
  Memberful are never listed in Popular or the Directory. A Supercast
  feed keeps its key in the URL's path, which the query check missed, so
  it was being listed.
- Adding a feed queues a scan of it, and an OPML import that added feeds
  scans what is due, so items show without pressing Scan.
- A file deleted to save space, or by hand, looks as if it was never
  downloaded: no "reaped" chip, just the Download button. The retention
  summary says "deleted".
- The feed header keeps its title and stats to one line each and wraps
  its buttons; a single feed's table drops the Feed column.
- Tests: adding a feed shows its item without Scan; a deleted file shows
  no "reaped"; paid-feed hosts and acast public ids in the unit test.

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

CHANGELOG.md

@@ -24,6 +24,16 @@ The long form, with what was wrong before and how it was found, is in
 
 - Popular shows the top 10, not 20, and counts everyone, you included. Your own feeds stay on it,
   marked Subscribed, and clicking one opens it.
+- Adding a feed scans it straight away, and an OPML import that added feeds scans them, so their
+  items show without pressing Scan.
+- A file deleted to save space, or by hand, looks as if it was never downloaded: no "reaped"
+  label, just the Download button. The retention summary says "deleted", not "reaped".
+
+### Security
+
+- Feeds from paid-feed services (Patreon, Supercast, Supporting Cast, Glow, Memberful) are never
+  listed in Popular or the Directory. A Supercast feed, which keeps its key in the URL's path
+  rather than the query, was being listed.
 
 ## [0.3.0] - 2026-09-11