feat: Add smooth slide-up animation to SelectionToolbox (#4832)

src/types/selectionOverlayTypes.ts

@@ -0,0 +1,9 @@
+import type { InjectionKey, Ref } from 'vue'
+
+export interface SelectionOverlayState {
+  visible: Readonly<Ref<boolean>>
+  updateCount: Readonly<Ref<number>>
+}
+
+export const SelectionOverlayInjectionKey: InjectionKey<SelectionOverlayState> =
+  Symbol('selectionOverlayState')