Show that DeadAir is still working on an episode (#176)

A new download in a show with DeadAir on plays at full length until its
copy is made, and nothing said so. Each file now carries
deadair_pending while DeadAir is on for its show and the copy is still
to come (not for one heard through, which it passes over), and the
episode's line and details say "Cutting dead air…". The maker sends a
deadair_done event when it finishes a file, and the page takes the list
again, so the line becomes how much shorter the episode is without a
reload.

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

CHANGELOG.md

@@ -10,9 +10,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - DeadAir: turn it on for a show in its settings, or with the button beside the speed while it plays, and its episodes play with long silences shortened, so podcasts finish sooner without sounding sped up. Your place carries over when you turn it on or off, each episode says how much shorter it is, and Settings shows the time it has saved you. It is off for every show until you turn it on (#171, #172).
+- An episode DeadAir is still working on says "Cutting dead air…", and changes to how much shorter it is when it is done, without a reload (#176).
 
 ### Fixed
 
+- A downloaded file's play, save, share and delete buttons stay on one row in the Files pane, instead of delete wrapping underneath (#175).
 - DeadAir shortens an episode you have opened but not played yet, instead of passing it over as if you had finished it (#173).
 - DeadAir shortens episodes with more than about a hundred long silences, which is most of an hour's conversation, instead of failing on them, and tries a file it failed on again after the next restart (#174).
 - Cover art up to 20 MB is shown, instead of nothing for anything over 5 MB, as for five of the Glass Cannon Network's feeds.