Player overlay as one piece, Up next always warm and on every source, Jellyfin never unmarks a watched episode

- Overlay: one layout for both designs (top bar with Up next as one of
  its buttons; one action band above the controls for the status pill,
  skips, next episode and end cards), one glass recipe (AppGlass) and
  one pill (FloatingPill); hovering any of them, or the open queue,
  holds the controls up.
- Up next: the first item (or the first continuation episode) is kept
  resolved on the app that puts it up, refreshed before it expires;
  Schedule and drop/paste can queue too.
- Jellyfin: WatchSession (core) counts real watched coverage; an
  episode is watched at 80 % or at its ending after half; a played one
  is re-marked after Playing (10.11 unmarks on open) and never gets a
  position; a peek leaves the old resume point; part-way resume points
  stay under 85 %.

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

apps/desktop/lib/src/queue/queue_logic.dart

@@ -2,9 +2,9 @@ import 'package:sync_relay_core/core.dart';
 
 import '../jellyfin/session_media.dart' show compareMemberIds;
 
-// Who puts an Up next item up, and when to get the first one ready. Pure:
-// only what every client sees in `state` decides, so all clients agree
-// without a wire message (like the Jellyfin auto-advance swapper).
+// Who puts an Up next item up. Pure: only what every client sees in
+// `state` decides, so all clients agree without a wire message (like the
+// Jellyfin auto-advance swapper).
 
 /// Who puts [item] up: [id] a member id; null with [why] when nobody here
 /// can (the item is skipped), null without [why] when nobody is around
@@ -66,22 +66,6 @@ String queueHowLabel(QueueItem item, {required String selfId}) {
   };
 }
 
-/// Seconds before the end at which the first Up next item is got ready.
-const queueWarmLeadSecs = 90.0;
-
-/// Whether to get the next item ready now: the current media is in its
-/// last [queueWarmLeadSecs], is buffered to its end, or has finished.
-bool queueWarmDue({
-  required String transport,
-  required double position,
-  required double duration,
-  required double bufferedTo,
-}) {
-  if (transport == 'finished') return true;
-  if (duration <= 0) return false;
-  return duration - position <= queueWarmLeadSecs || bufferedTo >= duration - 1;
-}
-
 /// "1:23:45" / "23:45" for [secs]; empty when unknown.
 String queueClock(double secs) {
   if (secs <= 0) return '';