新增表单提交功能：在浏览器命令中添加 submitForm 方法，支持通过选择器填写输入框并提交表单

plugin/lib/quickcomposer/browser/browser.js

@@ -326,7 +326,7 @@ const executeScript = async (tab, script, args = {}) => {
     const argValues = Object.values(args).map((v) => JSON.stringify(v));
 
     const wrappedScript = `
-      (function(${argNames.join(", ")}) {
+      (async function(${argNames.join(", ")}) {
         ${script}
       })(${argValues.join(", ")})
     `;