Forgot to readd join function!

resource/static/js/home.js

@@ -30,4 +30,33 @@ document.getElementById('create-button').addEventListener('click', async () => {
         }
     } catch (_) {
     }
+});
+
+document.getElementById('join-button').addEventListener('click', async () => {
+    try {
+        const username = getUsername();
+        const roomCode = document.getElementById('room-code-input').value.trim();
+        
+        if (!roomCode) {
+            alert("Please enter a room code.");
+            return;
+        }
+
+        // Verify the room exists by trying to join it
+        const res = await fetch(`/api/room/${roomCode}`, {
+            method: 'GET',
+            headers: { 'Content-Type': 'application/json' }
+        });
+        
+        if (res.ok) {
+            const allUsernames = JSON.parse(localStorage.getItem('usernames') || '{}');
+            allUsernames[roomCode] = pendingUsername;
+            localStorage.setItem('usernames', JSON.stringify(allUsernames));
+            
+            window.location.href = `/room/${roomCode}`;
+        } else {
+            alert("Room not found or invalid code.");
+        }
+    } catch (_) {
+    }
 });