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## Summary Add Gizmo transform controls to load3d - Remove automatic model normalization (scale + center) on load; models now appear at their original transform. The previous auto-normalization conflicted with gizmo controls — applying scale/position on load made it impossible to track and reset the user's intentional transform edits vs. the system's normalization - Add a manual Fit to Viewer button that performs the same normalization on demand, giving users explicit control - Add Gizmo Controls (translate/rotate) for interactive model manipulation with full state persistence across node properties, viewer dialog, and model reloads - Gizmo transform state is excluded from scene capture and recording to keep outputs clean ## Motivation The gizmo system is a prerequisite for these potential features: - Custom cameras — user-placed cameras in the scene need transform gizmos for precise positioning and orientation - Custom lights — scene lighting setup requires the ability to interactively position and aim light sources - Multi-object scene composition — positioning multiple models relative to each other requires per-object transform controls - Pose editor — skeletal pose editing depends on the same transform infrastructure to manipulate individual bones/joints Auto-normalization was removed because it silently mutated model transforms on load, making it impossible to distinguish between the original model pose and user edits. This broke gizmo reset (which needs to know the "clean" state) and would corrupt round-trip transform persistence. ## Screenshots (if applicable) https://github.com/user-attachments/assets/621ea559-d7c8-4c5a-a727-98e6a4130b66 ┆Issue is synchronized with this [Notion page](https://www.notion.so/PR-11274-gizmo-controls-3436d73d365081c38357c2d58e49c558) by [Unito](https://www.unito.io)