[Feature][Starlight] Add Compose-aligned Box layout support - #8820
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- Add "display: -x-box" parsing, generated CSS types, and Starlight layout selection. - Stack in-flow children in one content box with automatic sizing and per-item alignment, including negative offsets for oversized children. - Expose "-x-box-propagate-min-constraints" and "-x-box-match-parent-size" as layout-only CSS properties instead of layout-node attributes. - Defer match-parent children until the Box size is resolved and propagate effective minimum constraints before child measurement. - Keep Box-specific setters outside the shared layout-property macro so sibling runtimes do not require unsupported Box properties. - Add regression coverage for display parsing, alignment, sizing, minimum propagation, match-parent behavior, cache toggling, and RTL oversized alignment. - Publish the prefixed Box display value and properties through public type packages starting from Lynx 4.2. TEST: CSS parser, Starlight layout, and Box test objects compile; JSON, formatting, and public keyword checks pass. The full test binary is blocked by an unrelated existing compile error.
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