Scaling the graphics based on the resolution of the device

The current implementation is made for 1024 x 768 resolution.

The graphics should be made to scale according to the resolution of the device.
- Scale stage & backgrounds
- Scale items and make their locations relative to the size of the stage

No files or tests are identified in the issue. Start by locating the implementation for the stage, backgrounds, and item positions, then trace how the fixed 1024 × 768 dimensions are applied. Done means those graphics scale and item locations remain relative across device resolutions.

Written by the indexing model from the issue text.