refactor: enable useDepthPicking on Scene

[airslice]

When drag the map, Cesium needs to determine what 3D point on the globe you're interacting with. This pick
point becomes the rotation center. There are two methods:

1. Ray-based picking (useDepthPicking={false})

• Casts a ray from the camera through the screen pixel to find where it intersects the globe
• Problem when close to ground:
  • Ray intersection can fail due to floating-point precision issues
  • May miss the ground entirely at steep angles or very close distances
  • When the pick fails, Cesium has no rotation center, so it falls back to rotating the camera itself (camera
    rotates in place instead of orbiting around the ground)

2. Depth-based picking (useDepthPicking={true})

• Reads the depth buffer directly from the GPU to get the exact 3D position at that pixel
• Why it works better:
  • The depth buffer already contains precise position data from rendering
  • Works reliably even when extremely close to surfaces
  • No ray-casting calculations needed, just direct GPU readback

When zoomed in close to the ground:

• Without depth picking: Ray intersection occasionally fails → no valid pick point → camera rotates in place
  (wrong behavior)
• With depth picking: Depth buffer always provides accurate ground position → rotation always happens around the
  ground point → earth rotates correctly (expected behavior)

Enable this option could fix the bug we meet on Visualizer that left drag sometimes trigger camera rotation.

BTW its default value is true, i don't know why we set it to false https://cesium.com/learn/cesiumjs/ref-doc/Scene.html#useDepthPicking

[bnimit]

LGTM!