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.test.tsx

@@ -0,0 +1,85 @@
+/**
+ * @vitest-environment jsdom
+ */
+import {
+  cleanup,
+  fireEvent,
+  render,
+  screen,
+  waitFor,
+} from "@testing-library/react";
+import { Popover } from "@workspace/ui/components/popover";
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { RemarkForm } from "./remark-form";
+
+afterEach(() => {
+  cleanup();
+});
+
+function renderRemarkForm(props: Parameters<typeof RemarkForm>[0]) {
+  return render(
+    <Popover open>
+      <RemarkForm {...props} />
+    </Popover>
+  );
+}
+
+describe("RemarkForm", () => {
+  it("submits an intentionally cleared remark", async () => {
+    const onSave = vi.fn<Parameters<typeof RemarkForm>[0]["onSave"]>();
+
+    renderRemarkForm({ initialRemark: "old remark", onSave });
+
+    fireEvent.change(screen.getByPlaceholderText("在此输入备注..."), {
+      target: { value: "" },
+    });
+    fireEvent.click(screen.getByRole("button", { name: "保存" }));
+
+    await waitFor(() => expect(onSave).toHaveBeenCalledWith(""));
+  });
+
+  it("shows loading and keeps the input disabled while saving", async () => {
+    let resolveSave: (() => void) | undefined;
+    const onSave = vi.fn(
+      () =>
+        new Promise<void>((resolve) => {
+          resolveSave = resolve;
+        })
+    );
+
+    renderRemarkForm({ initialRemark: "old remark", onSave });
+
+    fireEvent.click(screen.getByRole("button", { name: "保存" }));
+
+    expect(
+      screen.getByRole("button", { name: "保存中..." }).hasAttribute("disabled")
+    ).toBe(true);
+    expect(
+      screen.getByPlaceholderText("在此输入备注...").hasAttribute("disabled")
+    ).toBe(true);
+
+    resolveSave?.();
+    await waitFor(() =>
+      expect(
+        screen.getByRole("button", { name: "保存" }).hasAttribute("disabled")
+      ).toBe(false)
+    );
+  });
+
+  it("shows an error state and preserves input after save failure", async () => {
+    const onSave = vi.fn<Parameters<typeof RemarkForm>[0]["onSave"]>();
+    onSave.mockRejectedValue(new Error("failed"));
+
+    renderRemarkForm({ initialRemark: "old remark", onSave });
+
+    fireEvent.change(screen.getByPlaceholderText("在此输入备注..."), {
+      target: { value: "kept remark" },
+    });
+    fireEvent.click(screen.getByRole("button", { name: "保存" }));
+
+    expect((await screen.findByRole("alert")).textContent).toBe(
+      "备注保存失败，请重试"
+    );
+    expect(screen.getByDisplayValue("kept remark")).not.toBeNull();
+  });
+});