Improve line number rendering by copying font styles

[TCOTC]

使用思源宋体时，代码块行号对不齐 https://ld246.com/article/1762527296449

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• https://github.com/adobe-fonts/source-han-serif/tree/release/?tab=readme-ov-file#otf
• 字体文件：https://github.com/adobe-fonts/source-han-serif/raw/release/Variable/WOFF2/OTF/SourceHanSerifSC-VF.otf.woff2

@font-face {
	font-family:"Noto Serif CJK";
	src:local("Noto Serif CJK"),url("./snippets/SourceHanSerifSC-VF.otf.woff2")format("woff2");
	font-style:normal;
	font-display:swap;
}
* {
  font-family:"Noto Serif CJK";
  font-weight: normal;
}