Fix origins for rotated SMT pads

[seunghyukchoe]

Combining pin1location(...) with origin("bottomleft") currently measures rotated SMT pads using their unrotated width and height. For example:

fp.string("soic8_pin1location(topside,right)")
  .origin("bottomleft")
  .circuitJson()

The resulting copper starts at x = +0.2 mm, y = -0.2 mm instead of (0, 0).

Calculate the rotated copper bounds for rectangular and pill-shaped SMT pads, respecting corner_radius, the legacy rect_border_radius, and pill radius. This also handles non-quarter-turn angles with rounded corners.

Validation on macOS arm64 with Bun 1.3.14, against upstream d0d2ee19:

• Nine new regression/control tests pass; seven fail against unchanged upstream.
• Full suite: 573 passed, 0 failed (bun test --timeout 30000). The longer timeout accommodates remote KiCad reference downloads; four default-timeout failures on unchanged upstream passed when retried.
• bun run build, bunx biome format ., and git diff --check pass. Formatting was checked before generating dist.
• Ten new SVG snapshots rendered and visually inspected.

Related origin work: #867 and #868.

Prepared with OpenAI Codex assistance, including an independent code review. I can respond to review feedback and revise the change.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-08T10:39:36.392966Z	069e65c	Manual request

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💡 Codex Review

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Reviewed commit: 50b9fc4d42

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[seunghyukchoe]

@codex review

Added the three requested control-footprint snapshots in 069e65c. All generated footprints in the new tests now have SVG coverage.

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Can't wait for the next one!

Reviewed commit: 069e65cc8e

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