Refine shell status controls and glass rendering; defer cursor redraw safely

shell/ferese-shell/assets/icons/status/notifications.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round">
+  <path d="M5 17h14l-1.5-2.5V10a5.5 5.5 0 0 0-11 0v4.5Z"/>
+  <path d="M10 20a2.3 2.3 0 0 0 4 0M12 3v1.5"/>
+</svg>