v0.2.0

Summary

• Add an `options` key allowing a custom prefix for all utilities and a global `!important` flag;
• Rounded utilities now combine position and radius size, support independent corner rounding, and border‑width utilities no longer set color/style, enabling cascading border colors;
• Breaking changes include moving `auto` margin to the configurable margin scale, extracting `defaultConfig` to a separate module, stricter `@apply` validation, and revising utility declaration order for spacing, radius and border width