fix(#HIF-37): 修复备注表单提交时未携带完整用户数据

备注保存前获取完整用户详情构造请求体，TC03 清空备注场景不再丢失其他字段。
拆出 RemarkForm 组件，增加保存中禁用态和失败错误提示。

apps/admin/src/sections/user/remark-form.tsx

@@ -0,0 +1,69 @@
+import { Button } from "@workspace/ui/components/button";
+import { Input } from "@workspace/ui/components/input";
+import { PopoverClose } from "@workspace/ui/components/popover";
+import { useRef, useState } from "react";
+
+interface RemarkFormProps {
+  initialRemark?: string | null;
+  onSave: (remark: string) => Promise<void> | void;
+}
+
+export function RemarkForm({ onSave, initialRemark }: RemarkFormProps) {
+  const [remark, setRemark] = useState<string>(initialRemark ?? "");
+  const [saving, setSaving] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const closeRef = useRef<HTMLButtonElement>(null);
+
+  const handleInputChange = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setRemark(event.target.value);
+  };
+
+  const handleSave = async (event: React.FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+    setError(null);
+    setSaving(true);
+
+    try {
+      await onSave(remark);
+      closeRef.current?.click();
+    } catch {
+      setError("备注保存失败，请重试");
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  return (
+    <form onSubmit={handleSave}>
+      <div className="mb-2 font-semibold text-sm">备注</div>
+      <Input
+        aria-invalid={Boolean(error)}
+        className="w-full"
+        disabled={saving}
+        onChange={handleInputChange}
+        placeholder="在此输入备注..."
+        type="text"
+        value={remark}
+      />
+      {error ? (
+        <p className="mt-2 text-destructive text-sm" role="alert">
+          {error}
+        </p>
+      ) : null}
+      <Button
+        className="mt-2"
+        disabled={saving}
+        size="sm"
+        type="submit"
+        variant="default"
+      >
+        {saving ? "保存中..." : "保存"}
+      </Button>
+      <PopoverClose asChild>
+        <button className="sr-only" ref={closeRef} type="button">
+          关闭
+        </button>
+      </PopoverClose>
+    </form>
+  );
+}