test: add capacitive touch slider snapshot test with polygon smtpads

[CharlesWong]

Summary

Adds a PCB snapshot test for a 5-segment capacitive touch slider using polygon SMT pads with solder mask coverage, demonstrating the use case from tscircuit/tscircuit#786.

Test: tests/components/normal-components/capacitive-touch-slider.test.tsx

The test creates a board with a chip footprint containing 5 diamond-shaped polygon smtpads arranged as a linear capacitive touch slider:

<chip name="U1" footprint={
  <footprint>
    {Array.from({ length: 5 }, (_, i) => {
      const offsetX = (i - 2) * 3.0
      return (
        <smtpad
          shape="polygon"
          points={diamondPoints(1.2, 2.5, offsetX, 0)}
          portHints={[`pin${i + 1}`]}
          coveredWithSolderMask={true}
        />
      )
    })}
  </footprint>
} />

Verifications

• ✅ All 5 pads render as polygon shape
• ✅ All pads have is_covered_with_solder_mask: true
• ✅ No pcb_solder_paste elements generated (correct for touch pads)
• ✅ Each polygon pad has 4 points (diamond shape)
• ✅ Pad centroids are distinct across the slider axis
• ✅ PCB SVG snapshot generated

Related

• Closes task from Support Capacitive Touch Slider element, add solvermask support to smtpad, document capacitive touch element tscircuit#786 checklist: "Create a tscircuit/core pcb snapshot test demonstrating polygon smtpads with solder mask work"

/claim #786

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Project	Deployment	Actions	Updated (UTC)
tscircuit-core-benchmarks	Ready	Preview, Comment	Mar 14, 2026 9:15pm

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

[CharlesWong]

Gentle ping — this PR is still relevant and the snapshot tests are passing. Happy to rebase or address any feedback if needed.