The function signature for `editor_textarea` in common.php has been updated
to accept `$detail` as a nullable string. This change allows the function to handle cases
where `$detail` might not be provided or could be null.
```php
- function editor_textarea(string $detail, string $name = 'desc', string $placeholder = '请输入'): string
+ function editor_textarea(?string $detail, string $name = 'desc', string $placeholder = '请输入'): string
```
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