The scanner is creating pages that are not ADA compliant

I ran the scanner on a new project today. It fixed one of my html files and also added three html error pages. I merged those PRs. (It also tried to add a test script, js and package.json it appears to have used to validate it’s fixes, but I did not merge those.) I reran the scanner to verify the fixes, and it found compliance issues with the three error pages copilot created in the previous scan.

For example the left side of this screenshot is the original html the scanner created, the right is the issue found when I ran the scanner again:

首先重现生成三个 HTML 错误页面的扫描器运行，然后结合截图中显示的无障碍问题检查这些生成的页面。未合并的测试脚本、JavaScript 文件和 package.json 可能有助于了解之前的修复是如何验证的。完成的标准是：生成的错误页面通过后续的扫描器运行，且不再报告相同的合规性问题。

由索引模型根据 Issue 内容生成。