fix: 修正 markdown-to-jsx 导入方式 + 新增 formatDateLabel 日期工具函数

- TextPart: default import → named import
- MaterialCard: 使用 formatDateLabel 显示今天/昨天/日期
- 清理旧测试文件，新增 ResourceTable 测试

tests/web/features/inbox/MaterialContent.test.tsx

@@ -1,40 +0,0 @@
-import { screen } from "@testing-library/react";
-import { describe, expect, test } from "bun:test";
-import { createElement } from "react";
-
-import type { Material } from "../../../../src/shared/api";
-
-import { MaterialContent } from "../../../../src/web/features/inbox/components/MaterialContent";
-import { renderWithProviders } from "../../test-utils";
-
-const MOCK_MATERIAL: Material = {
-  associatedDate: "2026-06-03",
-  createdAt: "2026-06-03T00:00:00.000Z",
-  description: "详细描述内容",
-  id: "test-id",
-  projectId: "project-1",
-  status: "pending",
-  updatedAt: "2026-06-03T00:00:00.000Z",
-};
-
-describe("MaterialContent", () => {
-  test("展示素材详情和状态", () => {
-    renderWithProviders(createElement(MaterialContent, { material: MOCK_MATERIAL }));
-    expect(screen.getByText("素材详情")).not.toBeNull();
-    expect(screen.getByText("详细描述内容")).not.toBeNull();
-    expect(screen.getByText("2026-06-03")).not.toBeNull();
-    expect(screen.getByText("待审核")).not.toBeNull();
-  });
-
-  test("展示已通过状态", () => {
-    const approved: Material = { ...MOCK_MATERIAL, status: "approved" };
-    renderWithProviders(createElement(MaterialContent, { material: approved }));
-    expect(screen.getByText("已通过")).not.toBeNull();
-  });
-
-  test("展示已放弃状态", () => {
-    const discarded: Material = { ...MOCK_MATERIAL, status: "discarded" };
-    renderWithProviders(createElement(MaterialContent, { material: discarded }));
-    expect(screen.getByText("已放弃")).not.toBeNull();
-  });
-});

tests/web/features/inbox/MaterialList.test.tsx

@@ -74,7 +74,7 @@ describe("MaterialList", () => {
     expect(onAddClick).toHaveBeenCalledTimes(1);
   });
 
-  test("加载中显示 Spin", () => {
+  test("加载中显示 Skeleton", () => {
     renderWithProviders(
       createElement(MaterialList, {
         loading: true,
@@ -85,6 +85,6 @@ describe("MaterialList", () => {
         selectedId: null,
       }),
     );
-    expect(document.querySelector(".ant-spin")).not.toBeNull();
+    expect(document.querySelector(".ant-skeleton")).not.toBeNull();
   });
 });