feat: upgrade to tailwindcss v4

tailwind.config.js

@@ -1,44 +0,0 @@
-/** @type {import('tailwindcss').Config} */
-export default {
-  content: [
-    "./src/**/*.{js,ts,jsx,tsx,html,svelte}",
-  ],
-  darkMode: "class",
-  theme: {
-    fontSize: {
-      "xs": ".65rem",
-      "sm": ".775rem",
-      "base": "0.65rem",
-      "md": "0.65rem",
-      "lg": "1rem",
-      "xl": "1.25rem",
-      "2xl": "1.5rem",
-      "3xl": "1.875rem",
-      "4xl": "2.25rem",
-      "5xl": "3rem",
-      "6xl": "4rem",
-      "7xl": "5rem",
-      "8xl": "6rem",
-      "9xl": "8rem",
-      "10xl": "10rem",
-      "11xl": "12rem",
-      "12xl": "14rem",
-      "13xl": "16rem",
-      "14xl": "18rem",
-    },
-    extend: {
-      fontFamily: {
-        "IconFamily": "IconFamily"
-      },
-      animation: {
-        'spin-fast': 'spin 0.4s linear infinite',
-      },
-      aspectRatio: {
-        "theme": "5 / 1"
-      }
-    }
-  },
-  plugins: [
-    require('@tailwindcss/forms'),
-  ],
-};