Layout Editor Upgrade (Transparency & Aspect Ratio)

This release introduces major enhancements to the Layout Editor, allowing users to customize the DS screen layout more precisely.

New Features

• Screen Transparency:
  Adjust the transparency (alpha) of the top and bottom screens independently.

• Keep Aspect Ratio:
  Lock the correct DS aspect ratio (4:3) during resizing to prevent distortion.

• Screen Stacking Order:
  Select which screen is drawn on top of the other.

• Layout Persistence:
  All layout changes (transparency, aspect ratio lock, stacking order) are now saved and restored automatically.

UI Improvements

• The Layout Editor now clearly shows whether you are editing the internal or external display layout.
• Improved visual feedback when selecting components.
• Added new sliders for transparency and checkboxes for aspect ratio lock and stacking order.

Internal Changes

• Refactored DSRenderer to handle per-screen alpha and stacking order.
• LayoutComponentView now stores and applies baseAlpha and onTop flags.
• Extended the layout data model to include new properties for transparency and stacking order.
• Layout saving and loading mechanisms now fully support the new settings.
• The Layout Editor now correctly persists changes when switching between layouts.