Pages of Atlas

Fixes

Prevents failed PBR atlas pages from retrying expensive builds every rendered frame.
Stops requests for PBR pages that do not exist in the active atlas plan.
Releases obsolete secondary atlas textures when switching to a lower-resolution or smaller resource-pack configuration.
Safely recreates secondary atlas pages when switching back to a multi-page configuration.
Stages replacement atlas generations until every physical page has uploaded successfully, preventing render access to uninitialized texture views.
Moves PBR and physical-atlas GPU cleanup onto the render thread.
Removes obsolete per-quad Sodium diagnostics and temporary atlas-placement logging.
Corrects the Mod Menu icon dimensions to 330×330.

Performance and memory

Eliminates repeated nonexistent-page work from the terrain-rendering path.
Removes diagnostic atomic contention and ThreadLocal entry churn from Sodium chunk compilation.
Prevents obsolete secondary atlases from retaining unnecessary VRAM after resource reloads.