modularize code, add dummy version of roverd

server/public/src/services/alertFeed.js

@@ -0,0 +1,25 @@
+registerModule('services/alertFeed', (require, exports) => {
+  const { socket } = require('globals/socket');
+
+  const container = document.getElementById('alerts');
+  if (!container) return;
+
+  function pushAlert({ color = '#2196f3', title, message, ts }) {
+    const div = document.createElement('div');
+    div.className = 'alert';
+    div.style.borderColor = color;
+    div.style.background = color + '22';
+    div.innerHTML = `<strong>${title || 'Notice'}</strong> - ${message || ''}`;
+    container.prepend(div);
+    while (container.children.length > 5) {
+      container.removeChild(container.lastChild);
+    }
+    setTimeout(() => {
+      if (div.parentElement === container) {
+        container.removeChild(div);
+      }
+    }, 15000);
+  }
+
+  socket.on('alert', pushAlert);
+});