feat(updater): add GitHub releases desktop updater

Adds the GitHub Releases desktop updater with release notes, startup notification, packaging metadata, tests, and CI fixes for Electron E2E.

apps/web/src/app/app.component.html

@@ -2,6 +2,8 @@
 
 <app-epg-progress-panel />
 
+<app-update-notification-panel />
+
 @if (usesCustomWindowControls) {
     <app-window-controls />
 }