Clean up AbstractController by removing references to old ResizeGizmo implementation:
- Remove utility layer mesh filtering logic
- Remove auto-show gizmo on hover
- Remove gizmo handle click filtering
- Remove unused Ray import
- Bump version to 0.0.8-26
These changes complete the migration to the new simplified ResizeGizmo architecture.
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Co-Authored-By: Claude <noreply@anthropic.com>