DEMO Update 2

Summary: Optimized performance when there are many hyphal node roots in the scene. Structure tooltips now show global production and consumption speeds for affected resources.

Performance optimizations:

1. Network thread detail automatically scales down when zoomed out (fewer curve points, branches, twigs)

2. Expensive bone-like chain calculations skipped when zoomed out

3. Thread shadows now drawn with one fast shader pass instead of looping over every segment

4. Structure-on-node checks use a simple yes/no list instead of a hash table

5. Decay edge segments scale with zoom

Tooltip fixes:

1. When a structure is added into the world, the tooltip now shows global production and consumption speed for resources affected.