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>

src/deadair.rs

@@ -189,9 +189,13 @@ pub async fn for_reader(ctx: &Ctx, user: i64, rows: &mut [crate::db::EntryRow])
         .collect();
     let copies: HashMap<i64, crate::db::Copy> =
         ctx.db.copies(&ids).await?.into_iter().map(|c| (c.enclosure_id, c)).collect();
+    let done = ctx.db.deadair_done(&ids).await?;
     for r in rows.iter_mut() {
+        // Heard through already: the maker passes it over, so nothing is coming.
+        let finished = r.duration.is_some_and(|d| d > 0 && r.position * 10 >= d * 9);
         let mut converted = false;
         for e in &mut r.enclosures {
+            e.deadair_pending = ids.contains(&e.id) && e.state == "done" && !done.contains(&e.id) && !finished;
             let Some(c) = copies.get(&e.id) else { continue };
             e.deadair = Some(c.saved_ms / 1000);
             // One position an item, however many files: the first with a copy sets the clock.
@@ -308,8 +312,9 @@ async fn next(ctx: &Ctx, failed: &mut std::collections::HashSet<i64>) -> Result<
         };
         let saved_ms = saved(&cuts);
         ctx.db.store_deadair(t.id, path.as_deref(), &serde_json::to_string(&cuts)?, saved_ms).await?;
+        ctx.out.emit(crate::ipc::Event::DeadairDone { feed: t.feed_id.clone(), enclosure: t.id, saved_s: saved_ms / 1000 });
+        // The event says it too (ev="deadair_done"); this line has how long it took and how many cuts.
         tracing::info!(
-            ev = "deadair",
             feed = t.feed_id,
             path = %src.display(),
             cuts = cuts.len(),