refactor: make position types internal to prevent unused export warnings

Author: Myestery

src/composables/graph/useViewportAwareMenuPositioning.ts

@@ -1,12 +1,12 @@
-export interface MenuPositionStyle {
+interface MenuPositionStyle {
   position: 'fixed'
   left: string
   top?: string
   bottom?: string
   transform: string
 }
 
-export interface MenuPositionOptions {
+interface MenuPositionOptions {
   /** The trigger element that opened the menu */
   triggerRect: DOMRect
   /** The menu overlay element */