Light source Y-coordinates in or near view frame cause broken animations

[blairfrandeen]

This is currently caught in the icosahedron_graphics_error() test in visualizer.rs. Creates a weird animation that appears to be cleaved halfway through, with the two halves rotating in opposite directions.

Likely due to errors and poor bookkeeping of the coordinate systems in circular_arc_hologram_path() function or thereabouts.

[blairfrandeen]

Looks fun, but ultimately not our goal here 🤪