fix(richtext-slate, ui): use PointerEvents to show tooltips on enabled / disabled buttons (#9006)

Fixes #9005

Note: I did not replace all instances of `onMouseEnter`, just the ones
that can be disabled and have `tooltip` set.

packages/richtext-slate/src/field/elements/Button.tsx

@@ -54,8 +54,8 @@ export const ElementButton: React.FC<ButtonProps> = (props) => {
         .filter(Boolean)
         .join(' ')}
       onClick={onClick || defaultOnClick}
-      onMouseEnter={() => setShowTooltip(true)}
-      onMouseLeave={() => setShowTooltip(false)}
+      onPointerEnter={() => setShowTooltip(true)}
+      onPointerLeave={() => setShowTooltip(false)}
     >
       {tooltip && <Tooltip show={showTooltip}>{tooltip}</Tooltip>}
       {children}