feat: add form validation and disable submit buttons when fields are empty

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

__tests__/e2e/homepage.spec.ts

@@ -0,0 +1,11 @@
+import { test, expect } from '@playwright/test';
+
+test('homepage has correct title and content', async ({ page }) => {
+  await page.goto('/');
+
+  // Wait for the redirect to /darmasaba
+  await page.waitForURL('/darmasaba');
+
+  // Check for the main heading
+  await expect(page.getByText('DARMASABA', { exact: true })).toBeVisible();
+});