fix: add pointer-events auto for expanded stack

Ensure expanded stack has proper pointer-events to allow interactions
with notifications behind the stack container.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: zombieJ

assets/geek.less

@@ -35,6 +35,10 @@
     width: 100%;
   }
 
+  &-stack-expanded {
+    pointer-events: auto;
+  }
+
   &-notice {
     position: absolute;
     pointer-events: auto;

assets/index.less

@@ -35,6 +35,10 @@
   }
 
   // ========================= Notice =========================
+  &-stack-expanded {
+    pointer-events: auto;
+  }
+
   &-notice {
     position: relative;
     display: block;