Handle play() and load() promises for audio elements

Updated audio playback and preloading logic to check for and handle returned promises from play() and load() methods. This prevents uncaught promise rejections in browsers where these methods may return undefined, improving reliability and error handling for notification sounds.

components/dashboard/ChatTable.tsx

@@ -92,9 +92,12 @@ export default function ChatTable() {
   // Play notification sound
   const playNotificationSound = () => {
     if (audioRef.current) {
-      audioRef.current.play().catch(e => {
-        console.log("Failed to play notification sound:", e);
-      });
+      const playPromise = audioRef.current.play();
+      if (playPromise !== undefined) {
+        playPromise.catch(e => {
+          console.log("Failed to play notification sound:", e);
+        });
+      }
     }
   };