Fix: prevent incorrect page calculation when calling next() or scrollTo() after left overscroll at first page

[hungtrn75]

Description

Fixed edge case where left overscroll at first page with loop=false would cause incorrect page calculation when subsequently calling next() or scrollTo() methods. The fix ensures proper page index handling during boundary overscroll scenarios.

Changes:

• Updated currentFixedPage() calculation logic to handle left overscroll at first page correctly
• Updated handlerOffsetDirection() to return consistent direction for small positive offsets when loop=false
• Added comprehensive test coverage for overscroll scenarios

Review

• I self-reviewed this PR

The changes maintain all existing library behaviors while fixing the overscroll edge case

Testing

• I added/updated tests
• Existing tests still pass
• I manually tested

Manual testing performed:

• Verified the fix resolves the specific overscroll issue shown in the attached video

Simulator.Screen.Recording.-.iPhone.16.Pro.-.2025-08-20.at.11.32.55.mp4

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