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

src/ipc.rs

@@ -62,10 +62,10 @@ impl Event {
             Event::DownloadDone { path, .. } => format!("    saved {path}"),
             Event::DownloadError { url, msg, .. } => format!("    failed {url}: {msg}"),
             Event::Reaped { path, bytes } => {
-                format!("reap {path} ({:.1} MB)", *bytes as f64 / 1_048_576.0)
+                format!("deleted {path} ({:.1} MB)", *bytes as f64 / 1_048_576.0)
             }
             Event::ReapDone { files, bytes } => format!(
-                "reaped {files} file(s), {:.1} MB",
+                "deleted {files} old file(s), {:.1} MB",
                 *bytes as f64 / 1_048_576.0
             ),
             Event::Status { feeds, pending, downloaded } => {