/claim #6 /closes #6

The circuit JSON was incomplete - it should have included mesh URLs for all components Resistors are common components that should have standard 3D models available The circuit-json generation process wasn’t providing mesh URLs for resistors

Fixed resistors not appearing in STEP file snapshots by adding default mesh URLs when components lack them. Now resistors properly load 3D models from external sources instead of being invisible, using GLTF loading.

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please review changes @seveibar