feat(core): pt units, table height as min-height, honor td width%

[NikPnevmatikos]

Summary

Fixes three rendering gaps that real-world email/CMS HTML (TinyMCE, Google Docs exports) exposed: pt units were silently dropped, height on table cells acted as a hard cap instead of a minimum, and a cell's width was ignored in row layout. A production email template's CTA button rendered as an empty blue chip — its white 16pt label fell back to 14px and overflowed the fixed-height cell onto the page background.

Changes

• parsePx now accepts pt at the CSS ratio 1pt = 4⁄3px, everywhere lengths are parsed (font-size, line-height, margins/paddings, borders, dimensions).
• height on table/tr/td/th is remapped to minHeight at build time (browser table semantics, CSS 2.1 §17.5); an explicit larger min-height still wins; height on non-table elements is unchanged.
• Table cells' width now shapes the row: all-percent rows distribute columns proportionally to their percents (15%/33%/15% keeps the 15:33:15 ratio); mixed rows pin sized cells via flexBasis and let widthless cells share the remainder; width-free rows keep the old flex: colspan behavior. Logic lives in a new pure module renderer/table-layout.ts.
• Tests: pt parsing, height→minHeight mapping (incl. min-height merge and non-table exemption), and a full resolveRowCellFlex suite — the first renderer-side logic with jest coverage (the module has no react-native imports).
• Docs/release: CHANGELOG entry, README "Supported CSS" + new "Table semantics" section, core version → 0.4.0.

Test plan

• npm run typecheck passes
• npm test passes (164 tests: 145 core incl. new suites, 19 video)
• npm run build succeeds
• cd example && npx tsc --noEmit passes
• Manually verified in the example app (web): with the raw email template, the CTA label renders white at 21.33px, fully inside the growing blue cell (minHeight 25 → 50px desktop / 100px mobile), and the middle column takes ~52% of the row per its declared width — at both desktop and mobile viewports.

Breaking changes

No API changes. Rendering behavior changes for existing content, gated by the minor bump (0.3 → 0.4, outside ^0.3.0):

• Tables with cell widths no longer render equal columns — they follow the declared widths.
• Fixed-height table cells now grow to fit content instead of clipping.
• Previously-dropped pt sizes now apply, so text set in pt changes size.

Migration: to keep old behavior for specific content, strip the relevant declarations via ignoredStyles={['width']} / ['height'] / ['fontSize'].