fix: Add validation and error handling for pin header rendering

[ARYPROGRAMMER]

Fixes #580
/claim #580

Enhances pin header component handling in jlc-parts-engine.ts by adding proper validation for pin_count and gender properties, with default values and error handling. This resolves TypeError issues when rendering pin headers and improves the robustness of the component by safely handling undefined or missing properties.

[imrishabh18]

Can you add a test for this? And also add the image of the 3D render after your changes

[ARYPROGRAMMER]

Can you add a test for this? And also add the image of the 3D render after your changes

testing locally would require updating fake snippet api db seed file with the snippet @tsci/imrishabh18.TB6612FNG. I can do the changes, but I think in the vercel preview deployment this is not working, so i'll just check again. once done i'll add test as well

[seveibar]

@ARYPROGRAMMER this is pretty sick, nice work, looking forward to seeing some kind of test to make sure future contributors don't break it 😁

[ARYPROGRAMMER]

@ARYPROGRAMMER this is pretty sick, nice work, looking forward to seeing some kind of test to make sure future contributors don't break it 😁

have a look please

[seveibar]

unfortunately this doesn't fix the bountied issue

It does look like a good contribution, but for the issue you linked i can't see how it could be related?

[seveibar]

this should be in a separate file <CadViewerWithErrorMessage />, we don't want to make giant files with custom handling and a ton of complexity, better to break things up

[github-actions]

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