复用空态原语收口项目新建卡片

PlatformEmptyState 增加 button 形态，支持空列表 CTA 复用同一套空态 chrome。

项目页空列表新建项目卡片改为复用 PlatformEmptyState，保留项目页局部尺寸样式。

补充共享空态按钮形态和项目页空态创建测试，并更新 TRACKING。

src/components/project/ProjectGalleryView.test.tsx

@@ -134,4 +134,28 @@ describe('ProjectGalleryView', () => {
     expect(deleteEditorProjectMock).toHaveBeenCalledWith('editor-project-1');
     expect(deleteEditorProjectMock).toHaveBeenCalledWith('editor-project-2');
   });
+
+  it('renders the empty project action with shared empty state chrome', async () => {
+    const onOpenProject = vi.fn();
+    listEditorProjectsMock.mockResolvedValueOnce([]);
+    createEditorProjectMock.mockResolvedValueOnce({
+      ...projectItems[0],
+      projectId: 'editor-project-new',
+    });
+    const user = userEvent.setup();
+
+    render(<ProjectGalleryView onOpenProject={onOpenProject} />);
+
+    const newProjectButton = await screen.findByRole('button', {
+      name: '新建项目',
+    });
+
+    expect(newProjectButton.className).toContain('platform-empty-state');
+    expect(newProjectButton.className).toContain('project-gallery__new-card');
+
+    await user.click(newProjectButton);
+
+    expect(createEditorProjectMock).toHaveBeenCalledTimes(1);
+    expect(onOpenProject).toHaveBeenCalledWith('editor-project-new');
+  });
 });