ManuelMRosa/SheetNest ? reverse-engineered prompt

Build me a Windows app for sheet metal nesting that helps a shop get the most parts onto each stock sheet with the least waste. I want to be able to import flat DXF files, and also bring in 3D STEP or IGES parts so they can be flattened into a nestable pattern automatically. The app should let me enter quantities for each part, including mirrored parts, choose from common sheet sizes or add my own, then run one click nesting and let me fine tune the layout by dragging, rotating, mirroring, and snapping parts if needed.

It should export clean cut ready DXF files for CAM software, and also generate a simple PDF report showing how many sheets are needed, total material, and a visual layout of each sheet. Please make it work offline, with autosave, recent projects, undo and redo, and support inches and millimeters. If you need current details for file formats or Windows behavior, look them up online.