[Lens] Color Mapping Nitpicks

[MichaelMarcialis]

The following are a few nitpick issues regarding the new Len color mapping interface (split off from a previous issue):

• [ ] Change the root-level flyout's color mapping edit icon button to use color="text".

  

• [ ] Attempting to click the top or bottom portions above or below the color mapping preview strip doesn't open the second-level color mapping flyout, despite showing a pointer icon on hover. Only clicking directly on the preview strip does it function correctly. Can we correct this so the pointer is only shown on areas that will trigger the second-level flyout?