In newer versions of ComfyUI Desktop, `app.extensionManager.setting.get()`
may return empty values even when settings are properly configured via
the API. This causes the dynamic field widgets (including image upload
buttons) to fail to load when entering an aiToolsId.
This adds a fallback that fetches settings from the server API
(`/api/settings`) when the frontend settings return empty, ensuring
the dynamic fields load correctly across all ComfyUI versions.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
