merge: resolve master conflicts for pwa hardening

- merge origin/master into PR #964 and keep embedded MPV test on the isolated playback sub-entrypoint

- centralize EPG capability through DataService.supportsEpg and update PWA web-e2e expectations

- split BrowserAccessError copy between Electron and PWA diagnostics

libs/workspace/shell/feature/src/lib/workspace-context-panel/components/workspace-context-category-view.component.html

@@ -1,4 +1,4 @@
-@if (items()?.length > 0) {
+@if ((items()?.length ?? 0) > 0) {
     <div class="nav-list">
         @if (statusText()) {
             <div class="context-inline-status">