Camera (apps/game/src/camera.rs):
- Replace yaw/pitch with a single Quat rotation. Mouse drag now does
yaw-around-world-Y * rotation * pitch-around-local-X, which is gimbal-free
and allows true 360° tumbling in any direction.
- Remove pitch clamps (ORBIT_MIN_PITCH / ORBIT_MAX_PITCH).
- Add ResetOrbitCamera resource + apply_orbit_reset system that snaps the
orbit camera back to default on demand.
- OrbitCamera::reset() helper.
Galaxy scene (apps/game/src/gameplay/galaxy_creation/):
- New axes.rs: spawn_axes() draws three emissive cylinders through the
origin (X=red, Y=green, Z=blue) as children of the scene root so they
rebuild with the rest of the galaxy.
- UI adds a 'Center View' button below Regenerate that inserts
ResetOrbitCamera; handled by reset_view_button_handler.
- Help text now mentions drag/zoom/escape.