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

shell/ferese-shell/assets/icons/status/notifications-off.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="M10.3 4.8A5.5 5.5 0 0 1 17.5 10v3M6.7 8.6a5.5 5.5 0 0 0-.2 1.4v4.5L5 17h10M10 20a2.3 2.3 0 0 0 4 0"/>
+  <path d="M4 4l16 16"/>
+</svg>