fix: strip kicad prefix from circuit-json and prevent footprinter crashes for library footprints

[techmannih]

This PR addresses issues with loading KiCad footprints by correctly handling the kicad: prefix . It ensures that library-prefixed footprints don't crash the standard footprinter parser and that the prefix is stripped when generating the final Circuit JSON for compatibility with 3D model loaders.

Key Changes

• Library Prefix Stripping: Implemented prefix stripping in NormalComponent.getFootprinterString(). When a footprint like kicad:Connector_JST/JST_PH_B6B... is used, the kicad: prefix is removed before being stored in cad_component metadata.
• Improved Footprint Resolution: Updated NormalComponent and Chip rendering phases (doInitialPcbComponentRender, doInitialPartsEngineRender) to use getFootprinterString() instead of raw props.footprint.
• Parser Guards: Added guards in _addChildrenFromStringFootprint and getPortsFromFootprint to prevent the @tscircuit/footprinter parser from attempting to process strings containing colons (library references). This fixes the Invalid footprint function, got "kicad" crash.
• Selector Compatibility: Maintained the original prefixed string in props and Footprint source attributes to ensure pcbSx selectors (e.g., & footprint[src^='kicad:']) continue to work.

Bug Fixes

• Fixed "Invalid footprint function" error when using KiCad footprints.
• Fixed issue where raw library prefixes were being passed into the final Circuit JSON footprinter_string fields.

fix https://linear.app/tscircuit/issue/TSC-394/kicad-prefix-footprints-are-passed-to-circuit-json-should-be-converted

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Project	Deployment	Actions	Updated (UTC)
tscircuit-core-benchmarks	Ready	Preview, Comment	Mar 11, 2026 6:58pm

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[seveibar]

slop implementation

[seveibar]

Solution is wrong. Footprinter string should not be defined

[github-actions]

This PR has been automatically marked as stale because it has had no recent activity. It will be closed if no further activity occurs.

[github-actions]

This PR was closed because it has been inactive for 1 day since being marked as stale.