bugfix(heightmap): Fix ray casting in BaseHeightMapRenderObjClass::Cast_Ray (2)

[xezon]

• Follow up for bugfix(heightmap): Reduce ray cast lengths and fix ray casting in BaseHeightMapRenderObjClass::Cast_Ray #2836

This change is follow up for #2836 and applies more fixing in the Cast_Ray function.

Before this change the ray cast was failing if the camera was positioned below the max terrain height. The logical consequence was that no unit could be ordered to move anywhere on close zoom.

With the fixed logic the initial terrain hit box is assembled in a way that the ray cast has a chance to hit it before moving forward with the narrowing search.

[greptile-apps]

Greptile Summary

This PR updates terrain ray casting to build and refine a ray-aligned search box.

• Limits the initial height range to the ray span.
• Refines terrain bounds before testing triangles.
• Tracks repeated box intersections during narrowing.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
Core/GameEngineDevice/Source/W3DDevice/GameClient/BaseHeightMap.cpp	Updates Cast_Ray to construct a bounded initial terrain box and refine its ray intersections.

_{Reviews (2): Last reviewed commit: "Fix ray height margin" | Re-trigger Greptile}