Feature/new float api

[NailxSharipov]

Migrate to iOverlay 9.0

• Update the float API to use conservative coordinate conversion and explicit bounds validation.
• Document coordinate limits and add regression tests for invalid inputs, empty geometry, and triangulator reuse.
• Adapt squared-length calculations to unsigned results and apply Clippy/formatting fixes.
• Bump i_triangle to 0.49.0.

[codecov]

Codecov Report

❌ Patch coverage is 47.95918% with 51 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
iTriangle/src/float/custom.rs	20.00%	16 Missing ⚠️
iTriangle/src/float/unchecked.rs	25.00%	15 Missing ⚠️
iTriangle/src/float/triangulatable.rs	40.00%	12 Missing ⚠️
iTriangle/src/float/triangulator.rs	77.77%	4 Missing ⚠️
iTriangle/src/int/triangulator.rs	0.00%	2 Missing ⚠️
iTriangle/src/float/uniform.rs	50.00%	1 Missing ⚠️
iTriangle/src/tessellation/uniform.rs	83.33%	1 Missing ⚠️

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