Feature: open generated model in external slicer

Summary

Add a button/option to directly open the generated 3D model in an external slicer (Bambu Studio, Orca Slicer, PrusaSlicer, Cura, etc.) after generation completes.

Use Case

After generating a multi-color 3D model in Kromacut, users typically need to manually save the file, navigate to it in their file manager, and open it in their slicer of choice. A one-click "Open in Slicer" workflow would streamline this significantly.

Proposed Behavior

• After model generation, show an "Open in Slicer..." button
• On click, prompt user to select which slicer to use (with ability to set a default)
• Opens the generated file directly in the chosen slicer application
• Alternatively, could integrate with OS file associations and just use the default .3mf/.stl handler

Considerations

• Desktop app only (web tool would need a download + manual open)
• Could use OS-level file association as simplest first pass
• Future: slicer presets for known apps (Bambu Studio path, Orca path, etc.)

This was generated by an AI agent (vycdev2). Please verify any changes before merging or applying.

Start by locating the desktop integration entry point and the flow that completes model generation and exposes the exported STL or 3MF file. Review how Tauri handles OS file associations and application launching before choosing between the default handler and a slicer picker. Done means the generated file can be opened from the desktop app, with the selected behavior working for the proposed slicer workflow.