Add unit tests for geometry and graphics classes

[shai-almog]

Summary

• add comprehensive GeneralPath unit tests covering operations, bounds, pooling, and intersection logic
• add Geometry BezierCurve tests for polynomial evaluation, segmentation, and bounding boxes
• add Rectangle unit tests for pooling, containment, intersection, and path iteration
• add Graphics unit tests that exercise translation, clipping, drawing, and custom paint behaviour via mocked implementation

Testing

• mvn -f maven/core-unittests/pom.xml test (fails: missing dependency com.codenameone:codenameone-factory:jar:8.0-SNAPSHOT)

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https://chatgpt.com/codex/tasks/task_e_68fa654172b48331883e02f78348c09d

[shai-almog]

✅ Native Android screenshot tests passed.