feat: add Vue widget demo node and development support

- Add LoraManagerDemoNode to node mappings for Vue widget demonstration
- Update .gitignore to exclude Vue widget development artifacts (node_modules, .vite, dist)
- Implement automatic Vue widget build check in development mode with fallback handling
- Maintain pytest compatibility with proper import error handling

vue-widgets/src/main.ts

@@ -0,0 +1,73 @@
+import { createApp, type App as VueApp } from 'vue'
+import PrimeVue from 'primevue/config'
+import DemoWidget from '@/components/DemoWidget.vue'
+
+// @ts-ignore - ComfyUI external module
+import { app } from '../../../scripts/app.js'
+
+const vueApps = new Map<number, VueApp>()
+
+// @ts-ignore
+function createVueWidget(node) {
+  const container = document.createElement('div')
+  container.id = `lora-manager-demo-widget-${node.id}`
+  container.style.width = '100%'
+  container.style.height = '100%'
+  container.style.minHeight = '300px'
+  container.style.display = 'flex'
+  container.style.flexDirection = 'column'
+  container.style.overflow = 'hidden'
+
+  const widget = node.addDOMWidget(
+    'lora_demo_widget',
+    'lora-manager-demo',
+    container,
+    {
+      getMinHeight: () => 320,
+      hideOnZoom: false,
+      serialize: true
+    }
+  )
+
+  const vueApp = createApp(DemoWidget, {
+    widget,
+    node
+  })
+
+  vueApp.use(PrimeVue)
+
+  vueApp.mount(container)
+  vueApps.set(node.id, vueApp)
+
+  widget.onRemove = () => {
+    const vueApp = vueApps.get(node.id)
+    if (vueApp) {
+      vueApp.unmount()
+      vueApps.delete(node.id)
+    }
+  }
+
+  return { widget }
+}
+
+app.registerExtension({
+  name: 'comfyui.loramanager.demo',
+
+  getCustomWidgets() {
+    return {
+      // @ts-ignore
+      LORA_DEMO_WIDGET(node) {
+        return createVueWidget(node)
+      }
+    }
+  },
+
+  // @ts-ignore
+  nodeCreated(node) {
+    if (node.constructor?.comfyClass !== 'LoraManagerDemoNode') return
+
+    const [oldWidth, oldHeight] = node.size
+
+    node.setSize([Math.max(oldWidth, 350), Math.max(oldHeight, 400)])
+  }
+})