fix(e2e): 等待 svg text 出现后再断言表名，避免 CI 时序失败

should display table names 在 CI 上因图未渲染完即断言导致 0 个 text

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: alswl

tests/e2e/er-diagram.spec.ts

@@ -21,7 +21,10 @@ test.describe('ER Diagram - Interaction', () => {
   });
 
   test('should display table names', async ({ page }) => {
+    // Wait for diagram to render table names (CI is slower)
     const tableNames = page.locator('svg text');
+    await expect(tableNames.first()).toBeVisible({ timeout: 15000 });
+
     const textCount = await tableNames.count();
     expect(textCount).toBeGreaterThan(0);