Layout Editor QOL & Achievement Display

This release introduces quality-of-life improvements to the layout editor and adds a new feature for external display.

New Features

Center Screen Button:
A new button has been added to the Layout Editor that allows users to quickly center the currently selected screen. This helps with alignment and improves the editing experience.
Achievement Display on External Screen:
When browsing ROMs, achievements are now shown on the external display (if connected).

Layouts now include a target property to distinguish between internal and external configurations.
This change helps organize, filter, and apply the correct layout depending on the display context.