экспорт маппинга

ui_builder/integration.py

@@ -89,7 +89,8 @@ def install_ui_builder(
         )
     )
 
-    template = (assets_dir / "index.html").read_text(encoding="utf-8")
+    editor_template = (assets_dir / "index.html").read_text(encoding="utf-8")
+    runtime_template = (assets_dir / "runtime.html").read_text(encoding="utf-8")
     asset_digest = hashlib.sha256()
     for asset_name in ("app.js", "styles.css"):
         asset_path = assets_dir / asset_name
@@ -101,6 +102,9 @@ def install_ui_builder(
 
     def render_page(mode: str) -> HTMLResponse:
         page_api = editor_api if mode == "editor" else runtime_api
+        # Runtime has its own HTML entry point and contains no Builder DOM at all.
+        # This prevents the visual editor from flashing during normal page load.
+        template = editor_template if mode == "editor" else runtime_template
         html = (
             template.replace("__UI_BUILDER_ASSETS__", assets_url.rstrip("/"))
             .replace("__UI_BUILDER_ASSET_VERSION__", asset_version)