Fix schStemLength scaling for resized custom symbol ports

[seveibar]

Motivation

• Ports inside custom <symbol /> elements with explicit width/height were not scaling their schematic stem length (schStemLength) to match the symbol resize, causing incorrect schematic_port.distance_from_component_edge and stem line endpoints after symbol scaling.

Description

• Track each generated stem line by adding schematic_stem_line_id to Port and store the created schematic line so it can be updated later during symbol resize in lib/components/primitive-components/Port/Port.ts.
• Implement doInitialSchematicSymbolResize on Port to recompute scaled stem length from the symbol transform and update schematic_port.distance_from_component_edge and the stem line endpoint (x2/y2) based on port direction.
• Preserve original behavior for ports without schStemLength or symbols without explicit sizing and keep initial port/stem creation logic intact.
• Add a regression test tests/components/primitive-components/port-sch-stem-length.test.tsx that asserts stem scaling for horizontal and vertical directions inside a resized custom symbol.

Testing

• Ran BUN_UPDATE_SNAPSHOTS=1 bun test tests/components/primitive-components/port-sch-stem-length.test.tsx tests/components/primitive-components/port-sch-stem-length-connected.test.tsx and both tests passed.
• Ran bunx tsc --noEmit for type checking and it completed with no errors.
• Ran bun run format which formatted files successfully.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
tscircuit-core-benchmarks	Ready	Preview, Comment	Feb 23, 2026 8:04pm

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[github-actions]

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