feat: Allow drag-and-drop from OpenHome to PKHeX

[Myldym]

Currently, it's possible to drag Pokémon from PKHeX into OpenHome, but not the other way around. I’d like to request support for dragging Pokémon from OpenHome into PKHeX using the mouse as well.

[andrewbenington]

I'll have to play around and see how easy it is to do this with Tauri and the current drag and drop library. I imagine this would involve attaching the pkm file's binary blob with an onDrag event, independent of the dnd library, but they might not play nice