fix: rollback & pin volar version

Author: sxzz

package.json

@@ -81,8 +81,8 @@
     "@types/hash-sum": "^1.0.2",
     "@types/node": "^20.14.15",
     "@vitejs/plugin-vue": "^5.1.2",
-    "@volar/jsdelivr": "~2.4.0-alpha.18",
-    "@volar/monaco": "~2.4.0-alpha.18",
+    "@volar/jsdelivr": "2.4.0-alpha.12",
+    "@volar/monaco": "2.4.0-alpha.12",
     "@vue/babel-plugin-jsx": "^1.2.2",
     "@vue/language-service": "~2.0.29",
     "assert": "^2.1.0",