feat: Add smooth connection animation to MCP dropdown

Adds a pulse animation when WebMCP connection is established.
The animation triggers regardless of dropdown state.

frontend/src/components/ConnectionDropdown.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { ref, computed, onMounted, onUnmounted } from 'vue'
+import { ref, computed, onMounted, onUnmounted, watch } from 'vue'
 import { storeToRefs } from 'pinia'
 import { useCanvasStore } from '../stores/canvas'
 import { connectWithToken, getConnectionInfo } from '../services/webmcp'
@@ -10,6 +10,18 @@ const { isConnected, isReconnecting, connectionStatus, connectionInfo } = storeT
 const isOpen = ref(false)
 const tokenInput = ref('')
 const isConnecting = ref(false)
+const justConnected = ref(false)
+
+// Watch for connection changes and trigger animation
+watch(isConnected, (newValue, oldValue) => {
+  if (newValue && !oldValue) {
+    // Just connected - trigger animation
+    justConnected.value = true
+    setTimeout(() => {
+      justConnected.value = false
+    }, 2500) // Animation duration
+  }
+})
 
 const statusText = computed(() => {
   if (isReconnecting.value) return 'Reconnecting...'
@@ -73,7 +85,7 @@ onUnmounted(() => {
 
 <template>
   <div class="connection-dropdown-container">
-    <button class="dropdown-trigger" @click.stop="toggleDropdown" title="WebMCP Connection">
+    <button class="dropdown-trigger" :class="{ 'just-connected': justConnected }" @click.stop="toggleDropdown" title="WebMCP Connection">
       <span class="status-dot" :class="statusClass"></span>
       <span>MCP</span>
       <svg class="chevron" :class="{ open: isOpen }" xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
@@ -141,6 +153,7 @@ onUnmounted(() => {
 <style scoped>
 .connection-dropdown-container {
   position: relative;
+  overflow: visible;
 }
 
 .dropdown-trigger {
@@ -360,4 +373,39 @@ onUnmounted(() => {
   text-align: center;
   padding: 0.5rem 0;
 }
+
+/* Connection animation - Smooth effect */
+.dropdown-trigger.just-connected {
+  animation: connectionPulse 2s ease-in-out;
+}
+
+@keyframes connectionPulse {
+  0% {
+    transform: scale(1);
+    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
+    border-color: var(--border-color);
+  }
+  15% {
+    transform: scale(1.05);
+    box-shadow: 0 0 8px rgba(16, 185, 129, 0.4),
+                0 0 20px rgba(16, 185, 129, 0.2);
+    border-color: #10b981;
+  }
+  30% {
+    transform: scale(1);
+    box-shadow: 0 0 12px rgba(16, 185, 129, 0.5),
+                0 0 30px rgba(16, 185, 129, 0.25);
+    border-color: #34d399;
+  }
+  50% {
+    box-shadow: 0 0 15px rgba(16, 185, 129, 0.4),
+                0 0 35px rgba(16, 185, 129, 0.2);
+    border-color: #10b981;
+  }
+  100% {
+    transform: scale(1);
+    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
+    border-color: var(--border-color);
+  }
+}
 </style>