Update devDependency unocss to v66.4.0

Author: renovate[bot]

packages/app/package.json

@@ -23,7 +23,7 @@
 		"svelte": "5.37.2",
 		"svelte-check": "4.3.0",
 		"typescript": "5.9.2",
-		"unocss": "66.3.3",
+		"unocss": "66.4.0",
 		"unplugin-icons": "22.2.0",
 		"vite": "7.0.6",
 		"wrangler": "4.27.0"