feat: add ## {.row} flex layout primitive with alignment support#22
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Introduces `{.row}` as a new layout heading syntax alongside `{.grid-N}`.
Content directly under `## {.row}` is auto-wrapped as implicit flex items;
`###` children are supported for per-item `{.left}`/`{.center}`/`{.right}`
alignment. Row-level `{.right}` and `{.center}` map to justify-content.
Also fixes duplicate CSS class names on row/grid/tabs nodes (syntactic
class names were leaking into props.classes), suppresses empty `<h2>`
terminators from rendering, and wires up row rendering in the React and
Tailwind renderers.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
{.row}heading syntax —## Toolbar {.row}creates a horizontal flex row; content is auto-wrapped as implicit flex items (no###needed)### {.left}/### {.center}/### {.right}on explicit children (works in both{.row}and{.grid-N}){.right}/{.center}on the##heading maps tojustify-contentrow/grid/tabsnodes (syntactic class names were leaking intoprops.classes)<h2>terminators being rendered as blank heading elementsrownode rendering in React and Tailwind renderersTest plan
npm test)## {.row}parses torowAST node with implicitgrid-itemchildren## {.row}inside:::cardand other containers renders correctly{.left}/{.right}/{.center}on###items render correct alignment classes{.right}/{.center}renderjustify-end/justify-centerin Tailwind outputwmd-row,wmd-grid,wmd-tabselementsrownodes🤖 Generated with Claude Code