Integrate Color Legend

[Phillyclause89]

Description:

Integrate the standalone standalone_color_legend.py functionality into the main ChessMoveHeatmap UI. This feature will provide users with a clear and interactive legend to interpret heatmap colors effectively.

Scope of Work:

1. Integration:
   • Adapt the functionality in standalone_color_legend.py for seamless integration into the main UI.
   • Ensure the color legend dynamically updates based on the heatmap's color scheme and intensity scaling.
2. Design:
   • Align the legend's design with the current UI style for consistency.
   • Add options for users to toggle the legend on or off.
3. Testing:
   • Verify the legend appears correctly across various heatmap scenarios.
   • Test for responsiveness and usability in different screen sizes.
4. Documentation:
   • Update the README to include the new feature, with a brief description and usage instructions.

Acceptance Criteria:

• The color legend is fully integrated into the main UI.
• Users can toggle the legend on or off.
• The legend dynamically updates based on the heatmap's settings.
• Documentation includes details about the color legend feature.

Additional Context (Optional):

• Reference File: standalone_color_legend.py