Better format and static type Desktop Flight

[mubinulhaque]

In accordance with style guide given here:

• Remove space between extends statement and class doc comment
• Add doc comments to variables and functions where possible
• Replace exclamation marks with not keyword
• Format multiline statements for more readability
• Add spaces before and after equal signs
• Remove unnecessary _ready() function
• Specify return type of function physics_movement()
• Replace emit_signal("signal") with signal.emit()

Disclaimer

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