[DOCS] Fix types and documentation for applySceneSettings

[aidinabedi]

Description

This PR does the following fixes to applySceneSettings's settings parameter:

• Fixes type for settings.render.lightingCells from Vec3 to number[]
• Fixes optional properties and documents the defaults
• Adds missing properties with description and defaults

Checklist

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

[willeastcott]

Minor point, but the engine codebase keeps JSDoc blocks to 100 columns and most of these additions exceed that. Would be great if you could address that in this PR please. 🙏

[Copilot]

Pull Request Overview

This PR updates JSDoc documentation for the settings.render parameters to clarify their optional nature and provide default values. The changes enhance API documentation by making it explicit which parameters are optional and what their default values are.

• Added optional markers [] to previously required-looking parameters
• Added default value information to parameter descriptions
• Added documentation for new sky mesh and lightmap filter parameters

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