fix(web): minor bug fixes (#9696)

Co-authored-by: Mirone <Saul-Mirone@outlook.com>

tests/affine-local/e2e/blocksuite/code/crud.spec.ts

@@ -0,0 +1,14 @@
+import { test } from '@affine-test/kit/playwright';
+import { expect } from '@playwright/test';
+
+import { initCodeBlockByOneStep } from './utils';
+
+test.describe('Code Block Autocomplete Operations', () => {
+  test('angle brackets are not supported', async ({ page }) => {
+    // open the home page and insert the code block
+    await initCodeBlockByOneStep(page);
+    await page.keyboard.type('<');
+    const codeUnit = page.locator('affine-code-unit');
+    await expect(codeUnit).toHaveText('<');
+  });
+});