Tighten up typing for RigidBodyComponent#type

[willeastcott]

This pull request improves type safety and documentation for the type property in the RigidBodyComponent class by specifying a more precise type annotation. The changes clarify that the type property can only be one of BODYTYPE_DYNAMIC, BODYTYPE_KINEMATIC, or BODYTYPE_STATIC, rather than a generic string.

Type annotation improvements for RigidBodyComponent.type:

• Updated the private _type property declaration to specify its type as BODYTYPE_DYNAMIC|BODYTYPE_KINEMATIC|BODYTYPE_STATIC instead of a generic type.
• Updated the setter and getter JSDoc comments for type to use the more precise type annotation, improving code clarity and tooling support. [1] [2]

Checklist

• I have read the contributing guidelines
• My code follows the project's coding standards
• This PR focuses on a single change

[Copilot]

Pull request overview

This pull request enhances type safety for the RigidBodyComponent class by replacing generic type annotations with precise union types for the type property. The changes specify that the property can only accept one of three specific body type constants (BODYTYPE_DYNAMIC, BODYTYPE_KINEMATIC, or BODYTYPE_STATIC), improving code clarity and providing better tooling support for developers.

Key changes:

• Updated the private _type field's JSDoc type annotation from implicit to explicit union type
• Updated the type setter's JSDoc annotation from generic string to the specific union type
• Updated the type getter's JSDoc annotation from generic string to the specific union type

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