7e63fce706
Normalize printer_options_with_variant_2 (stride=2) machine limit vectors during preset merge to handle legacy 3MF/projects that store only a single (normal,silent) pair despite multiple printer variants, preventing set_with_restore() size-mismatch crashes. Crash error message during 3MF import as project: <img width="833" height="274" alt="image" src="https://github.com/user-attachments/assets/f92148a9-98c6-47b7-a0ab-d5ac8b1f2be4" /> 3MF attached that causes the bug. [cube.3mf.zip](https://github.com/user-attachments/files/25318309/cube.3mf.zip)