Show move and resize cursors on hover (#280)

* Change to move cursor on hover

* Show resize handlers on hover

src/scene/types.ts

@@ -7,6 +7,11 @@ export type SceneState = {
   viewBackgroundColor: string | null;
 };
 
+export type SceneScroll = {
+  scrollX: number;
+  scrollY: number;
+};
+
 export interface Scene {
   elements: ExcalidrawTextElement[];
 }