A play's trace holds the playlist, audio and saved place it fetched (#192)

hls.js sends traceparent on its own requests (xhrSetup); a beacon, which
cannot set a header, and Safari's player, fetching the playlist itself,
carry it in the query, which the server reads where there is no header.

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

CHANGELOG.md

@@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
-- The page reports its errors, the player's, how long play takes to start and how long it stalls to the server's log, and the requests one tap sets off share a trace (#190).
+- The page reports its errors, the player's, how long play takes to start and how long it stalls to the server's log, and the requests one tap sets off share a trace, the playlist, audio and saved place of what it played included (#190, #192).
 - Saving an episode from a show with DeadAir on saves it without its dead air, at your breathing room (#186).
 - Choose the pause DeadAir leaves where it cuts a silence, from 0.2 to 0.5 seconds, for each show in its settings, as its breathing room, on a slider from brisk to relaxed. It is 0.3 seconds unless you change it, up from 0.2, which made speech sound rushed (#182, #183).
 
@@ -20,6 +20,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - The container is built on Debian 13 (trixie) instead of 12, so DeadAir uses ffmpeg 7.1 instead of 5.1 (#177).
 - DeadAir no longer makes a shortened copy of each episode. It plays the original with its long silences left out, ready a few seconds after the download, with no gap where a silence was cut and no extra disk space (#181).
 
+### Fixed
+
+- All Subscriptions, and every item list, comes up faster, most of all the first time after a quiet spell: it took half a second to two (#188).
+
 ### Security
 
 - Cloudflare no longer keeps a copy of the audio you play, which it served to anyone it let in without checking they subscribe (#189).