Fix copper pour bounds for offset boards

[seveibar]

Summary

• derive the default copper-pour outline from the rendered pcb_board center, width, and height
• preserve explicit copper-pour outlines and custom board outlines
• add a visual regression test for a board centered away from the PCB origin

Root cause

When a rectangular board used boardAnchorPosition, the rendered pcb_board.center moved away from (0, 0). Copper-pour rendering left outline undefined, so the solver synthesized bounds as -width / 2 ... width / 2 and -height / 2 ... height / 2, ignoring the board center. The pour therefore stayed centered on the origin instead of following the board.

Impact

Automatic copper pours now follow rectangular boards whose center is offset, including boards positioned with boardAnchorPosition. Existing explicit pour and polygon board outlines remain authoritative.

Validation

• regression reproduced before the fix: expected minimum X 11, received -9
• 18 focused copper-pour tests passed
• bunx tsc --noEmit
• bun run build
• Biome check on changed TypeScript files

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Project	Deployment	Actions	Updated (UTC)
tscircuit-core-benchmarks	Ready	Preview	Aug 13, 2026 10:06pm

[tscircuitbot]

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Thank you for your contribution! 🎉

PR Rating: ⭐⭐
Impact: Minor

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