Fix clicks on pie segments larger than half the pie

[halfhp]

Fixes #118

Cause

PieRenderer.getContainingSegment located the clicked segment using signedDistance, which returns the shortest angular path between two angles and is therefore capped at 180 degrees. For a segment sweeping more than 180 degrees, a click in the part of the segment nearest its start measures as lying "behind" the segment's end and is rejected. With values 8, 1, 1 the first segment sweeps 288 degrees, and clicks in roughly its first 108 degrees returned no segment. The reporter's diagnosis pointed at exactly this calculation.

Fix

Segments are drawn clockwise from their start angle, so a point is inside a segment when its clockwise distance from the segment's start is less than the sweep. A new clockwiseDistance helper computes that in the 0 to 360 range, and the containment check uses it. The old signedDistance is left in place since it's a protected static that subclasses may use, but it is no longer involved in hit-testing.

Verification

• New PieRendererTest case builds the 8/1/1 pie from the report and probes ten angles across all three segments, including one degree past the big segment's start and one degree either side of each boundary. It fails on the old code at the first probe and passes on the fix.
• Existing hit-test cases, including the one for a 51 percent segment, still pass.
• Full suite: 212 tests, 0 failures. Lint, core release AAR and demoapp debug build pass.
• Release note added under 1.5.12.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.07%. Comparing base (c16a720) to head (fe795dc).
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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #135      +/-   ##
============================================
- Coverage     69.16%   69.07%   -0.09%     
+ Complexity     1233     1227       -6     
============================================
  Files           109      109              
  Lines          5160     5158       -2     
  Branches        537      536       -1     
============================================
- Hits           3569     3563       -6     
- Misses         1248     1253       +5     
+ Partials        343      342       -1     

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