arena: closer 3P zoom angles, shoulder-camera start
Add more granular zoom distances for tight third-person views:
[0, 0.5, 1, 1.5, 2, 3, 4.5, 6, 9] (was [0, 3, 5, 8, 12])
Start at zoomLevel 2 (1 unit back) by default, giving a shoulder-camera
view showing mostly the back of the player's head and surrounding area.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>