Better format and static type Desktop Jump

[mubinulhaque]

In accordance with style guide given here:

• Add doc comments to variables and functions where possible
• Replace exclamation marks with not keyword
• Format multiline statements for more readability
• Specify return type of function physics_movement()

Disclaimer

No generative AI was used to enhance or create the code given here.

[BastiaanOlij]

LGTM

[BastiaanOlij]

Thanks!