fix(quick): keep _blend importable from the host module for the notification port

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014KYuz59BEmcx66GwNT3cmL

bec_widgets/utils/quick/host.py

@@ -25,6 +25,7 @@ from qtpy.QtQuickWidgets import QQuickWidget
 from qtpy.QtWidgets import QApplication, QWidget
 
 from bec_widgets.utils.quick.tokens import METRICS, ThemeTokens, app_theme
+from bec_widgets.utils.quick.tokens import blend as _blend  # kept for ports importing it from here
 
 logger = bec_logger.logger