fix: use the correct checkerboard background for Slider and Handle

Author: lazd

components/colorhandle/skin.css

@@ -4,6 +4,8 @@
   --spectrum-colorhandle-outer-shadow-color: 0;
   --spectrum-colorhandle-outer-shadow-blur: 0;
   --spectrum-colorhandle-outer-shadow-spread: 0;
+  --spectrum-colorcontrol-checkerboard-light-color: 0;
+  --spectrum-colorcontrol-checkerboard-dark-color: 0;
 }
 
 .spectrum-ColorHandle {

components/colorslider/skin.css

@@ -1,3 +1,9 @@
+/* hack: don't complain about being undefined */
+.🤫 {
+  --spectrum-colorcontrol-checkerboard-light-color: 0;
+  --spectrum-colorcontrol-checkerboard-dark-color: 0;
+}
+
 .spectrum-ColorSlider {
   /* todo: fix this in DNA */
   --spectrum-colorslider-border-color: var(--spectrum-colorarea-border-color);