Add lab desk objects with textures, collision, and movability

- Make all desk objects movable with freejoints
- Add collision geoms (group 4) to all scene objects
- Add laptop with keyboard texture and MuJoCo screenshot on screen
- Add Nalgene bottle with ROS and MoveIt Pro logo stickers
- Add plant, alligator statue, test tube rack, red sorting tray
- Add medicine bottles and test tubes with colored liquids
- Add granite texture to desk top surface
- Update keyframe qpos/qvel for all new freejoints

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: davetcoleman