feat: convert color values from RGB/hex to OKLCH and HSLA

The commit modifies color definitions in the design system, converting
RGB and hex color values to more modern color formats (OKLCH for colors
and HSLA for grays) while preserving the same visual appearance.

Author: kampsy

package.json

@@ -16,7 +16,7 @@
 		"url": "https://github.com/kampsy/ui/issues"
 	},
 	"scripts": {
-		"dev": "vite dev --port 3000",
+		"dev": "vite dev --port 3100",
 		"build": "vite build && npm run package",
 		"preview": "vite preview",
 		"package": "svelte-kit sync && svelte-package && publint",
@@ -130,4 +130,4 @@
 			"@semantic-release/github"
 		]
 	}
-}
+}