Initial release.

flutterwindcss is Tailwind CSS v4's design system and styling vocabulary for Flutter — a Material-free styling engine over the framework's primitive widgets layer.

• Tokens — the full Tailwind v4 color palette (FwPalette, baked, no runtime color math) and the complete shadcn semantic vocabulary (FwColors — 32 roles: the 19 core + chart1…5 + 8 sidebar*), plus radius, shadow, typography, opacity, border-width, z-index, blur and breakpoint scales.
• Theming — FwTheme (pure path) and FwThemeExtension (Material interop), read via context.fw; FwTokens.light / FwTokens.dark; and FwAnimatedTheme, which crossfades every token (FwTokens.lerp) on a theme or brightness change.
• The .tw utility API — an accumulator with last-wins conflict resolution that resolves lazily against interaction states (hover/focus/pressed/disabled, plus group/peer) and viewport/container breakpoints (sm…xl, containerSm…). Covers spacing, sizing, color, gradients, borders, radius, typography, effects, filters, transforms (2D + 3D), blend modes, and interactivity.
• Layout widgets — FwRow / FwColumn / FwWrap, FwStack / FwPositioned, and FwGrid (a real CSS-grid render object), all directional (RTL-aware) and responsive.

Requires Flutter ≥ 3.29 / Dart ≥ 3.7.