fix: add zOffsetFromSurface property to cadmodel documentation

[rushabhcodes]

This pull request updates the documentation for the cadmodel element to clarify and expand on how to reposition 3D models, especially with the new zOffsetFromSurface property. It also adds a detailed properties table for easier reference.

Enhancements to documentation for model positioning:

• Added zOffsetFromSurface as an option for repositioning models, alongside positionOffset and rotationOffset, in the introductory section.
• Introduced a new section explaining how to use zOffsetFromSurface to control the vertical distance of the model from the PCB surface, including an example usage.

Documentation improvements:

• Added a comprehensive properties table listing all supported attributes for the cadmodel element, including types and descriptions for modelUrl, stepUrl, positionOffset, rotationOffset, zOffsetFromSurface, size, and modelUnitToMmScale.

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Project	Deployment	Review	Updated (UTC)
docs	Ready	Preview, Comment	Dec 14, 2025 10:15am

[Copilot]

Pull request overview

This pull request enhances the documentation for the cadmodel element by adding comprehensive information about the zOffsetFromSurface property and introducing a new properties reference table. The documentation now provides users with a clearer understanding of how to position 3D models vertically relative to the PCB surface, along with a centralized reference for all available properties.

Key changes:

• Added zOffsetFromSurface as a positioning option alongside existing positionOffset and rotationOffset properties
• Introduced a new dedicated section with example code demonstrating the use of zOffsetFromSurface
• Added a comprehensive properties reference table listing all supported attributes with their types and descriptions

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