feat: Ferrum Layout Engine — grid, flex, container, sidebar, spacing utilities - #5
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Provides layout utilities for grid, flexbox, container, sidebar, and spacing: - Breakpoint system with responsive value resolution - Grid: auto-fit/auto-fill, responsive columns, gap presets - Stack: HStack/VStack presets, flex direction/gap/wrap - Container: max-width presets with centering - Sidebar: responsive sidebar layouts with collapsible support - Spacing: 24-token scale with directional margin/padding Includes: - useBreakpoint() React hook with resize listener - All utilities generate Tailwind-compatible class strings - CSSProperties objects for dynamic values - 121 unit tests covering all modules and edge cases
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Summary
Implements the Ferrum Layout module from the roadmap (Beta → production-ready). A comprehensive layout utility library with Tailwind-compatible class generation.
Modules
breakpointsuseBreakpoint()hookgridstackcontainersidebarspacingKey Design
useBreakpoint()hook with debounced resize listenerresolveResponsiveValue<T>()walks breakpoint ladder for cascading valuesTests
Files Added
src/lib/ferrum-layout/— 8 TypeScript files__tests__/ferrum-layout.test.ts— 121 testsCloses roadmap item: Ferrum Layout Beta ✅