refactor theme toggler code

uno.config.ts

@@ -0,0 +1,26 @@
+import {
+	defineConfig,
+	presetIcons,
+	presetTypography,
+	transformerVariantGroup,
+	transformerDirectives,
+	presetWind
+} from "unocss";
+
+import { extractorSvelte } from "unocss";
+
+export default defineConfig({
+	extractors: [extractorSvelte],
+
+	presets: [
+		presetIcons(),
+		presetTypography(),
+		presetWind({
+			dark: "class"
+		})
+	],
+
+	transformers: [transformerVariantGroup(), transformerDirectives()],
+
+	safelist: ["i-fa6-solid:moon", "i-fa6-solid:sun"]
+});