fix: simplify coding project card rail

tests/e2e/main-navigation.spec.ts

@@ -64,6 +64,8 @@ test.describe('Makelore module navigation without setup flow', () => {
 
       await expect(page).toHaveURL(/\/chat$/);
       await expect(page.getByRole('button', { name: '新增项目' })).toBeVisible();
+      await expect(page.getByText('已有项目')).toHaveCount(0);
+      await expect(page.getByText('选择一个项目继续')).toHaveCount(0);
       const projectCards = page.getByTestId('coding-existing-projects');
       await expect(projectCards).toBeVisible();
       await expect(projectCards.getByRole('button')).toHaveCount(2);