fix(webui): persist user messages for refresh

nanobot/webui/ws_http.py

@@ -348,6 +348,12 @@ class GatewayHTTPHandler:
         if not _is_websocket_channel_session_key(decoded_key):
             return _http_error(404, "session not found")
         scope = self.workspaces.scope_for_session_key(decoded_key)
+        session_messages: list[dict[str, Any]] | None = None
+        if self.session_manager is not None:
+            session_data = self.session_manager.read_session_file(decoded_key)
+            raw_messages = session_data.get("messages") if isinstance(session_data, dict) else None
+            if isinstance(raw_messages, list):
+                session_messages = [m for m in raw_messages if isinstance(m, dict)]
         data = build_webui_thread_response(
             decoded_key,
             augment_user_media=self.media.augment_transcript_media,
@@ -356,6 +362,7 @@ class GatewayHTTPHandler:
                 text,
                 workspace_path=scope.project_path,
             ),
+            session_messages=session_messages,
         )
         if data is None:
             return _http_error(404, "webui thread not found")