feat(api-nodes): add copy button to Gemini Chat node

comfy_api_nodes/nodes_gemini.py

@@ -5,7 +5,10 @@ See: https://cloud.google.com/vertex-ai/generative-ai/docs/model-reference/infer
 from __future__ import annotations
 
 
+import json
+import time
 import os
+import uuid
 from enum import Enum
 from typing import Optional, Literal
 
@@ -350,7 +353,27 @@ class GeminiNode(ComfyNodeABC):
         # Get result output
         output_text = self.get_text_from_response(response)
         if unique_id and output_text:
-            PromptServer.instance.send_progress_text(output_text, node_id=unique_id)
+            # Not a true chat history like the OpenAI Chat node. It is emulated so the frontend can show a copy button.
+            render_spec = {
+                "node_id": unique_id,
+                "component": "ChatHistoryWidget",
+                "props": {
+                    "history": json.dumps(
+                        [
+                            {
+                                "prompt": prompt,
+                                "response": output_text,
+                                "response_id": str(uuid.uuid4()),
+                                "timestamp": time.time(),
+                            }
+                        ]
+                    ),
+                },
+            }
+            PromptServer.instance.send_sync(
+                "display_component",
+                render_spec,
+            )
 
         return (output_text or "Empty response from Gemini model...",)