test: reproduce connector corner orientation false positive

[ShiboSoftwareDev]

Summary

• reproduce the orientation checker warning on a connector that faces one of two equally-near board edges
• assert the current deterministic but incorrect x- recommendation
• add a visual SVG snapshot that labels the false-positive warning

Verification

• bun test (175 pass)
• bun run build
• bunx biome format tests/lib/check-connector-accessible-orientation.test.tsx