feat: add WebSocket real-time updates with toast notifications (#5)

public/app.js

@@ -1444,3 +1444,92 @@ function makeTaskCardDraggable(cardEl, task) {
     cardEl.classList.remove('dragging');
   });
 }
+
+// ============ WEBSOCKET REAL-TIME UPDATES ============
+let ws = null;
+let reconnectAttempts = 0;
+const MAX_RECONNECT = 5;
+
+function initWebSocket() {
+  const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
+  const wsUrl = `${protocol}//${window.location.host}`;
+  
+  ws = new WebSocket(wsUrl);
+  
+  ws.onopen = () => {
+    console.log('WebSocket connected');
+    reconnectAttempts = 0;
+  };
+  
+  ws.onmessage = (event) => {
+    try {
+      const { type, payload } = JSON.parse(event.data);
+      handleWebSocketMessage(type, payload);
+    } catch (err) {
+      console.error('WebSocket message error:', err);
+    }
+  };
+  
+  ws.onclose = () => {
+    console.log('WebSocket disconnected');
+    if (reconnectAttempts < MAX_RECONNECT) {
+      reconnectAttempts++;
+      setTimeout(initWebSocket, 2000 * reconnectAttempts);
+    }
+  };
+  
+  ws.onerror = (err) => {
+    console.error('WebSocket error:', err);
+  };
+}
+
+function handleWebSocketMessage(type, payload) {
+  switch (type) {
+    case 'task_created':
+      if (typeof loadTasks === 'function' && CURRENT_PAGE === 'tasks') {
+        loadTasks();
+        showNotification(`New task: ${payload.title}`);
+      }
+      break;
+      
+    case 'task_updated':
+      if (typeof loadTasks === 'function' && CURRENT_PAGE === 'tasks') {
+        loadTasks();
+      }
+      break;
+      
+    case 'task_deleted':
+      if (typeof loadTasks === 'function' && CURRENT_PAGE === 'tasks') {
+        loadTasks();
+        showNotification('Task deleted');
+      }
+      break;
+      
+    case 'usage_updated':
+      if (typeof loadUsage === 'function' && CURRENT_PAGE === 'usage') {
+        loadUsage();
+      }
+      break;
+      
+    default:
+      console.log('Unknown WebSocket message:', type);
+  }
+}
+
+function showNotification(message) {
+  // Create a simple toast notification
+  const toast = document.createElement('div');
+  toast.className = 'toast-notification';
+  toast.textContent = message;
+  document.body.appendChild(toast);
+  
+  setTimeout(() => {
+    toast.classList.add('fade-out');
+    setTimeout(() => toast.remove(), 300);
+  }, 3000);
+}
+
+// Initialize WebSocket on page load
+if (typeof CURRENT_PAGE !== 'undefined') {
+  initWebSocket();
+}

public/styles.css

@@ -1025,3 +1025,41 @@ label {
   background: var(--primary);
   color: white;
 }
+
+/* Toast Notifications */
+.toast-notification {
+  position: fixed;
+  bottom: 20px;
+  right: 20px;
+  background: var(--primary);
+  color: white;
+  padding: 1rem 1.5rem;
+  border-radius: 8px;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
+  z-index: 1000;
+  animation: slideIn 0.3s ease;
+}
+
+.toast-notification.fade-out {
+  animation: fadeOut 0.3s ease forwards;
+}
+
+@keyframes slideIn {
+  from {
+    transform: translateX(100%);
+    opacity: 0;
+  }
+  to {
+    transform: translateX(0);
+    opacity: 1;
+  }
+}
+
+@keyframes fadeOut {
+  from {
+    opacity: 1;
+  }
+  to {
+    opacity: 0;
+  }
+}