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

py/nodes/demo_vue_widget_node.py

@@ -0,0 +1,72 @@
+"""
+Demo node to showcase Vue + PrimeVue widget integration in ComfyUI LoRA Manager.
+
+This node demonstrates:
+- Vue 3 + PrimeVue custom widget
+- Widget state serialization
+- Integration with ComfyUI workflow
+"""
+
+
+class LoraManagerDemoNode:
+    """
+    A demo node that uses a Vue + PrimeVue widget to configure LoRA parameters.
+    """
+
+    def __init__(self):
+        pass
+
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "required": {
+                "lora_demo_widget": ("LORA_DEMO_WIDGET", {}),
+            },
+            "optional": {
+                "text": ("STRING", {
+                    "default": "",
+                    "multiline": True,
+                    "placeholder": "Additional prompt text..."
+                }),
+            }
+        }
+
+    RETURN_TYPES = ("STRING", "FLOAT", "STRING")
+    RETURN_NAMES = ("model_name", "strength", "info")
+
+    FUNCTION = "process"
+
+    CATEGORY = "loramanager/demo"
+
+    def process(self, lora_demo_widget, text=""):
+        """
+        Process the widget data and return the configuration.
+
+        Args:
+            lora_demo_widget: Widget data containing model_name and strength
+            text: Optional text input
+
+        Returns:
+            Tuple of (model_name, strength, info_string)
+        """
+        model_name = lora_demo_widget.get("modelName", "")
+        strength = lora_demo_widget.get("strength", 1.0)
+
+        info = f"Vue Widget Demo - Model: {model_name}, Strength: {strength}"
+        if text:
+            info += f"\nAdditional text: {text}"
+
+        print(f"[LoraManagerDemoNode] {info}")
+
+        return (model_name, strength, info)
+
+
+# Node class mappings for ComfyUI
+NODE_CLASS_MAPPINGS = {
+    "LoraManagerDemoNode": LoraManagerDemoNode
+}
+
+# Display name mappings
+NODE_DISPLAY_NAME_MAPPINGS = {
+    "LoraManagerDemoNode": "LoRA Manager Demo (Vue)"
+}