fix(FEC-11733): Hide mouse cursor when it's idle in fullscreen (#647)

use the same technique like we use to hide the bottom bar and use the css classes representing the player state to toggle the cursor (hide and show it along with the bottom bar)

src/styles/_shell.scss

@@ -11,6 +11,7 @@
   -ms-user-select: none;
   user-select: none;
   -webkit-tap-highlight-color: transparent;
+  cursor: none;
 
   .playback-gui-wrapper,
   .ad-gui-wrapper {
@@ -90,3 +91,13 @@
     -ms-transform: translateY(-$default-hovering-offset);
   }
 }
+
+.player.casting,
+.player.metadata-loaded.hover,
+.player.state-paused,
+.player.state-idle,
+.player.ad-break,
+.player.menu-active,
+.player.overlay-active {
+    cursor: auto;
+}