feat: add utility function to format URLs and create new CSS file for styling

src/lib/utils.js

@@ -0,0 +1,6 @@
+const SERVER_URL = import.meta.env.VITE_SERVER_URL || 'http://localhost:3000'
+
+export function formatUrl(url) {
+  if (!url) return ''
+  return url.startsWith('http') ? url : `${SERVER_URL}${url}`
+}