HASTE v1.1.5 beta 5 — AURORA REWORK

- Replaced longitude-based aurora shaping with continuous spherical noise to remove the visible wrap seam.
- Added irregular, broken curtain bands and varied folds instead of a uniform ring around the horizon.
- Aurora is now limited to icy/taiga biome categories and uses a smoothed weight to fade in and out over about eight seconds at biome borders.
- Visual direction takes broad inspiration from Solas Shader's variable aurora appearance and stronger cold-biome presence; no Solas shader code is included.
