fix(overlays): focus overlay when presented (#20997)

fixes #19882, fixes #17126

core/src/components/toast/toast.tsx

@@ -272,6 +272,7 @@ export class Toast implements ComponentInterface, OverlayInterface {
           ...getClassMap(this.cssClass),
           'toast-translucent': this.translucent
         }}
+        tabindex="-1"
         onIonToastWillDismiss={this.dispatchCancelHandler}
       >
         <div class={wrapperClass}>