feat: enable looping for audio tracks

Ensure audio tracks loop continuously to improve user experience by maintaining audio ambiance without interruption. This change prevents abrupt stops when audio files reach their end, enhancing the seamlessness of sound playbacks.

script.js

@@ -2,6 +2,10 @@ const audioFiles = {
     rain: new Audio('audio/rain.mp3'),
 };
 
+for (const audio in audioFiles) {
+    audioFiles[audio].loop = true;
+}
+
 function toggleSound() {
     if (!playing) {
         for (const audio in audioFiles) {