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).

Layout System Enhancements

• 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.