Add "Invert colormap" param checkbox in the ColorMapWidget #53
Description
From DataLab-Platform/DataLab#296
UX design enhancement proposal
Add a visible checkbox (or toggle indicator) labeled "Invert colormap" directly in the colormap manager widget. This checkbox should:
- Reflect the current state of the global "Invert colormap" param
- Allow the user to toggle inversion directly from the colormap widget
- Update the colormap preview in real-time when toggled, so the preview always matches the final rendering
This would make the inversion state discoverable at the point of use, eliminating confusion.