Import EasyEDA courtyard (layer 12) as pcb_courtyard_outline and update snapshots

[seveibar]

Motivation

• EasyEDA uses specific layers for courtyard/keepout artwork that should be preserved as courtyard geometry in Circuit JSON rather than silkscreen paths.

Description

• Map EasyEDA TRACK and ARC shapes on layer 12 to pcb_courtyard_outline elements by adding handleCourtyardPath and handleCourtyardArc and importing pcb_courtyard_outline from circuit-json in lib/convert-easyeda-json-to-tscircuit-soup-json.ts.
• Include pcb_courtyard_outline elements when computing pcb_component bounds so component width/height reflect courtyard geometry.
• Add a focused regression test tests/convert-to-soup-tests/c14877-courtyard.test.ts and its SVG snapshot to verify courtyard import for C14877.

Testing

• Ran BUN_UPDATE_SNAPSHOTS=1 bun test tests/convert-to-soup-tests/c14877-courtyard.test.ts, which passed and wrote the updated SVG snapshot.
• Ran bun test tests/convert-to-ts/C14877.test.ts, which passed.
• Ran typecheck with bunx tsc --noEmit, which succeeded.
• Ran formatting with bun run format, which succeeded.
• Note: a full run of BUN_UPDATE_SNAPSHOTS=1 bun test tests/convert-to-ts previously surfaced unrelated timeouts in other tests (C165948, C472489) that are not caused by this change.

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Codex Task