UI Preview: Character & Homebrew Sync Testing

Testing UI for character and homebrew item synchronization. The goal is to make managing characters and custom content smoother and clearer while also introducing the ability to share homebrew items across worlds and with other players/gms. This is an early look at how characters, world items, and vault content will sync and update, with clear controls for uploading, overwriting, and version awareness. More polish and features to come as testing continues.