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/tsconfig.node.json

@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "composite": true,
+    "skipLibCheck": true,
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "allowSyntheticDefaultImports": true
+  },
+  "include": ["vite.config.mts"]
+}