feat(html-player): add feature-flagged shared controls (#1194)

* feat(html-player): bridge engine state to shared controls

* fix(html-player): avoid HLS subtitle event reentry

* fix(html-player): restore delayed HLS default subtitles

* refactor(html-player): split controls bridge collaborators

* feat(html-player): add feature-flagged shared controls

* test(html-player): cover shared-controls source ownership

* feat(html-player): pass shared-controls playback metadata

* docs(player-controls): describe HTML5 shared-controls bridge

* docs(player-controls): clarify HTML5 rollout effect

* fix(html-player): reveal diagnostics from fullscreen

* fix(html-player): defer HLS event resolution

* refactor(html-player): isolate video element session

libs/ui/playback/src/lib/web-player-view/web-player-view.component.spec.ts

@@ -53,6 +53,8 @@ class StubHtmlVideoPlayerComponent {
     readonly channel = input<unknown>();
     readonly volume = input(1);
     readonly showCaptions = input(false);
+    readonly isLive = input(true);
+    readonly interactionEnabled = input(true);
     readonly startTime = input(0);
     readonly seriesNavigation = input<unknown>(null);
     readonly timeUpdate = output<{ currentTime: number; duration: number }>();