Feature/int offset

[NailxSharipov]

Summary

• Add integer-based stroke, variable stroke, and outline APIs.
• Migrate to the new coordinate adapter and resource APIs.
• Fix near-parallel miter joins, winding-rule simplification, and geometry edge cases.
• Expand regression coverage and migrate the overlay editor to egui/eframe.

Breaking changes

• Split mesh APIs into mesh::int and mesh::float.
• Remove the divide API.
• Bump i_overlay to 9.0.0 and i_float / i_shape to 5.0.0.

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 84.81174% with 238 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...erlay/src/mesh/int/variable_stroke/builder_join.rs	64.03%	73 Missing ⚠️
iOverlay/src/mesh/int/variable_stroke/build.rs	44.73%	21 Missing ⚠️
iOverlay/src/mesh/float/variable_stroke/offset.rs	60.00%	20 Missing ⚠️
iOverlay/src/mesh/int/join.rs	83.33%	12 Missing ⚠️
...ay/src/mesh/int/variable_stroke/tests_reference.rs	89.58%	10 Missing ⚠️
iOverlay/src/mesh/float/style.rs	93.54%	8 Missing ⚠️
iOverlay/src/mesh/int/outline/build.rs	78.94%	8 Missing ⚠️
iOverlay/src/mesh/int/stroke/builder_join.rs	65.00%	7 Missing ⚠️
iOverlay/src/mesh/int/style.rs	82.92%	7 Missing ⚠️
iOverlay/src/core/overlay.rs	82.85%	6 Missing ⚠️
... and 23 more

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