Bug/fix shape binding

[NailxSharipov]

Summary

Fix hole binding, shape hierarchy, and area filtering.

Changes

• Preserve shared vertices until hole binding and hierarchy construction finish.
• Fix OGC hole winding and self-touch traversal.
• Correct hole binding in vector output.
• Preserve min_output_area during float overlay reinitialization.
• Fix minimum-area filtering for sliced contours.
• Add regression tests.

Testing

• cargo test
• cargo fmt
• cargo clippy

Checklist

• Added tests for new behavior or bug fixes
• Updated docs/examples if needed

[codecov]

Codecov Report

❌ Patch coverage is 81.15942% with 13 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
iOverlay/src/bind/segment.rs	42.85%	8 Missing ⚠️
iOverlay/src/core/extract.rs	88.88%	2 Missing ⚠️
iOverlay/src/core/hierarchy.rs	75.00%	2 Missing ⚠️
iOverlay/src/vector/extract.rs	87.50%	1 Missing ⚠️

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