fix(playback): close legacy picture-in-picture on video replacement (#1538)

* fix(playback): close legacy picture-in-picture on video replacement

* test(playback): wait for the selected video before PiP setup

* test(playback): await changed settings before PiP navigation

* fix(playback): release legacy WebKit picture-in-picture

CLAUDE.md

@@ -1155,7 +1155,7 @@ engine` (restart required) or
   `pictureInPictureActive`/`canPictureInPicture`, and command
   `togglePictureInPicture()`. HTML5, Video.js, and ArtPlayer use standard
   element PiP from the adapter's attached video; shared ArtPlayer keeps vendor
-  `pip: false`, while preference-off native/vendor paths remain unchanged. The
+  `pip: false`, while preference-off native/vendor controls keep their own UI. The
   capability-gated button sits before fullscreen and uses active enter/exit
   semantics; entry is disabled until metadata, and the action is disabled while
   an operation is pending. Embedded MPV reports capability/state false with a
@@ -1168,7 +1168,14 @@ engine` (restart required) or
   serialized, and binding generation plus exact video identity protects
   replacement and teardown from stale completion. Video.js Tech reset and
   ArtPlayer rebuild rebind with exact-owner cleanup; HTML5 source changes on a
-  retained target preserve PiP.
+  retained target preserve PiP. Legacy HTML5/ArtPlayer teardown and Video.js
+  Tech replacement also release exact-owned PiP through
+  `web-video-picture-in-picture-lifecycle.ts`, independent of the controls
+  preference. A one-shot listener on the retired video closes late native/vendor
+  entries without retaining the host or touching another video's PiP. Legacy
+  WebKit presentation-mode PiP also returns the retired video to inline; its
+  presentation-change listener ignores fullscreen/inline events until a late
+  PiP entry consumes it.
   Standard PiP shows the browser/OS video surface without Angular control
   chrome, with browser-dependent subtitles. AirPlay, Cast, Document PiP, a PiP
   keyboard shortcut, and Embedded MPV popup/native support are out of scope.