[NEW FEATURE] Export Sketch to DXF

[max-mrgrsk]

What's New

Users can now export any sketch to DXF format directly from the context menu of the sketch feature in the feature tree.

How to Use

1. Right-click on any sketch in the feature tree
2. Select "Export to DXF" from the context menu
3. Both environments show a file save dialog

Known Limitations

⚠️ Blocked by engine: Exported files cannot be opened by several DXF viewers due to engine output format

Why This Matters

This feature is essential for manufacturing workflows:

• CNC milling machines (3-axis) require 2D formats for toolpath generation
• Laser cutting software primarily supports 2D formats

Technical Implementation

• Uses sendSceneCommand with export2d instead of Rust export rustContext.export()
• Rust export is designed for whole scene export, but we need selection-based export
• Generates meaningful filenames from sketch variable names (e.g., bracket-sketch.dxf)

Future Improvements

The Rust export system should be refactored into a more flexible architecture that can handle:

• ✅ Whole file export (current) rustContext.export()
• 🔄 Selection-based export (this PR's approach) (for all selections and all formats) rustContext.exportEntities()

This would replace the current sendSceneCommand approach and enable users to select geometry in the viewport and export just that selection.

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Testing: Includes comprehensive test coverage and works in both desktop and browser environments.

Closes: #7989

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Project	Deployment	Preview	Comments	Updated (UTC)
modeling-app	✅ Ready	Preview	Comment	Aug 12, 2025 2:50pm

[max-mrgrsk]

Hold off on merging until the DXF fix lands later this week.

[pierremtb]

Awesome! 🔥

Hold off on merging until the DXF fix lands later this week.

You might want to keep it in Draft state then. We can still review that will 100% prevent accidental merges (esp. since it's green already!)

[andrewvarga]

It's maybe nuance but @jtran had a PR recently which was using electron param instead of checking isDesktop() directly, so following that direction you could check for window.electron? That way it wouldn't be necessary to check writeFile and showSaveDialog and throw an error potentially.

But it may be not so simple because I see you're mocking the value of isDesktop in the test file.