chore(dashboard): 更新 MDI 图标子集 (248 → 249 icons)

添加 mdi-share-variant 图标

dashboard/src/assets/mdi-subset/materialdesignicons-subset.css

@@ -1,4 +1,4 @@
-/* Auto-generated MDI subset – 248 icons */
+/* Auto-generated MDI subset – 249 icons */
 /* Do not edit manually. Run: pnpm run subset-icons */
 
 @font-face {
@@ -836,6 +836,10 @@
   content: "\F0832";
 }
 
+.mdi-share-variant::before {
+  content: "\F0497";
+}
+
 .mdi-shield-check::before {
   content: "\F0565";
 }