docs: add missing Chinese translation for extending-default-theme.md

Added translation for an alert note.

Original text: Result (**warning!**: flashing colors, sudden movements, bright lights):

Translation: 结果(**注意!**:画面闪烁、快速闪现、强光刺激):
pull/4852/head
Darrin DeYoung 4 months ago committed by GitHub
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commit 9edecbeae6
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@ -289,7 +289,7 @@ provide('toggle-appearance', async ({ clientX: x, clientY: y }: MouseEvent) => {
</style>
```
Result (**warning!**: flashing colors, sudden movements, bright lights):
结果(**注意!**:画面闪烁、快速闪现、强光刺激):
<details>
<summary>Demo</summary>

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