style: add comment for why we need height

Author: brandyscarney

core/src/components/input/input.scss

@@ -108,6 +108,8 @@
   width: 100%;
   max-width: 100%;
 
+  // Ensure the input fills the full height of the native wrapper.
+  // This prevents the wrapper from being the click event target.
   height: 100%;
   max-height: 100%;