fix: render code block props as `data-*` attributes on native `pre`

fix: render code block props as `data-*` attributes on native `pre`comarkdown/comark #463 · 4 diagrams

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01 / 06Code block props now map to data attributesNative pre tags now get data-language, data-filename, data-highlights, and data-meta. exports in +25 −0 to convert code block props.
02 / 06HTML stringifier now maps code block attributesThe core HTML renderer emits data-prefixed attributes for standard code blocks. calls in +3 −2.
03 / 06UI adapters now remap native pre attributesVue, React, Svelte, and Angular render data attributes on native pre tags while custom components keep raw props., , , and call for native elements in +7 −3.
04 / 06Raw HTML pre attributes now stay untouchedAuthored pre attributes pass through unchanged and child binding expressions keep their original scope. and check for raw HTML flags before remapping in +8 −3.
05 / 06Bundle size suite updated for new adaptersSize snapshots reflect the new attribute normalizer logic across 3 framework packages. asserts distribution bundle size snapshots in +3 −3.
06 / 06Everything this change touchedCore attribute mapping, stringification, 4 framework adapters, and test suites.

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