fix: finalize highlight behavior

[farnabaz]

This PR aim to define the final structure for highlighted codes. Comark will keep \n chars between lines and will treat .line spans as inline element.
The final behavior is same as Shiki's default behavior

[vercel]

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Project	Deployment	Actions	Updated (UTC)
comark	Ready	Preview	Apr 1, 2026 2:51pm
comark-nextjs	Ready	Preview	Apr 1, 2026 2:51pm
comark-nuxt	Ready	Preview	Apr 1, 2026 2:51pm
comark-svelte	Ready	Preview	Apr 1, 2026 2:51pm
comark-twoslash	Ready	Preview	Apr 1, 2026 2:51pm
comark-vue	Ready	Preview	Apr 1, 2026 2:51pm

[pkg-pr-new]

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comark

npm i https://pkg.pr.new/comarkdown/comark@88

@comark/ansi

npm i https://pkg.pr.new/comarkdown/comark/@comark/ansi@88

@comark/html

npm i https://pkg.pr.new/comarkdown/comark/@comark/html@88

@comark/nuxt

npm i https://pkg.pr.new/comarkdown/comark/@comark/nuxt@88

@comark/react

npm i https://pkg.pr.new/comarkdown/comark/@comark/react@88

@comark/svelte

npm i https://pkg.pr.new/comarkdown/comark/@comark/svelte@88

@comark/vue

npm i https://pkg.pr.new/comarkdown/comark/@comark/vue@88

commit: 8a7be7e