fix: render rounded smt pad textures

[vahapogut]

Fixes #500

Summary

• Render rect and rotated_rect SMT pads with positive rectBorderRadius/corner_radius as rounded canvas paths in the pad texture.
• Keep non-rounded SMT pads on the existing circuit-to-canvas path.
• Add coverage for texture-space mapping, radius scaling, rotation, and non-rounded pad fallback.

Verification

• bun run build
• bun x biome check src\utils\pad-texture.ts tests\pad-texture.test.ts
• Direct bun helper verification for rounded and plain SMT pads
• git diff --check

Note: bun test tests\pad-texture.test.ts is blocked on this Windows machine by the repo preload bun-match-svg importing looks-same/sharp; sharp fails to install/link locally.

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Project	Deployment	Actions	Updated (UTC)
3d-viewer	Ready	Preview, Comment	Jun 23, 2026 12:49pm