Preserve courtyards during footprint compaction

[ShiboSoftwareDev]

Summary

• detect when a compact footprinter candidate would remove courtyard geometry from an imported EasyEDA footprint
• keep the exact imported footprint in that case
• explain the preservation decision in CLI output

Tests

• bun test tests/lib/import/convert-imported-footprint-to-footprinter.test.ts
• bunx tsc --noEmit
• bun run build

[github-actions]

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