fix: agent profile save button not working

- Replace form attribute with ref-based form submission to avoid
  potential portal-related form resolution issues in base-ui Dialog
- Add null guard for fetchUsersAll return value to prevent crash
  when API returns null data

web/app/dashboard/agents/_components/edit.tsx

@@ -2,7 +2,7 @@
 
 import { zodResolver } from "@hookform/resolvers/zod";
 import { CheckIcon, ChevronsUpDownIcon } from "lucide-react";
-import { useCallback, useEffect, useState } from "react";
+import { useCallback, useEffect, useRef, useState } from "react";
 import { Controller, Resolver, useForm } from "react-hook-form";
 import { toast } from "sonner";
 import { z } from "zod/v4";
@@ -206,7 +206,7 @@ function AgentEditDialogBody({
   const [users, setUsers] = useState<AdminUser[]>([]);
   const [userSelectOpen, setUserSelectOpen] = useState(false);
   const [loading, setLoading] = useState(false);
-  const userOptions = users.map((user) => ({
+  const userOptions = (Array.isArray(users) ? users : []).map((user) => ({
     value: String(user.id),
     label: `${user.nickname || user.username} (${user.username})`,
   }));
@@ -215,7 +215,7 @@ function AgentEditDialogBody({
       const [usersData] = await Promise.all([
         fetchUsersAll(),
       ]);
-      setUsers(usersData);
+      setUsers(Array.isArray(usersData) ? usersData : []);
     } catch (error) {
       toast.error(error instanceof Error ? error.message : "加载选项失败");
     }
@@ -228,6 +228,7 @@ function AgentEditDialogBody({
     resolver: editFormResolver,
     defaultValues: buildFormWithDefaultTeam(null, defaultTeamId),
   });
+  const formRef = useRef<HTMLFormElement>(null);
   const {
     control,
     handleSubmit,
@@ -265,8 +266,6 @@ function AgentEditDialogBody({
     await onSubmit(buildPayload(values));
   }
 
-  const formId = "agent-edit-form";
-
   return (
     <ProjectDialog
       open={open}
@@ -283,7 +282,11 @@ function AgentEditDialogBody({
           >
             取消
           </Button>
-          <Button type="submit" form={formId} disabled={saving || loading}>
+          <Button
+            type="button"
+            onClick={() => formRef.current?.requestSubmit()}
+            disabled={saving || loading}
+          >
             {saving ? "保存中..." : "保存"}
           </Button>
         </>
@@ -295,7 +298,7 @@ function AgentEditDialogBody({
         </div>
       ) : (
         <form
-          id={formId}
+          ref={formRef}
           onSubmit={handleSubmit(onFormSubmit)}
           className="space-y-4"
         >