Fix NPE in handleTouchMove when activePath is null

[kharrison-jp]

Summary

• Fixes NullPointerException in ScratchPathManager.handleTouchMove() when activePaths[pointerIndex] is null
• This occurs when touch MOVE events are replayed from the pending queue during layout initialization, but the corresponding DOWN event was lost across an attach cycle
• Adds a null guard that safely skips the move event; the next DOWN event creates the path normally
• Adds a null guard that creates a new path starting from the current touch position, preserving the scratch stroke rather than dropping the entire movement

Crash

  java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Path.isEmpty()' on a null object reference
      at ScratchPathManager.handleTouchMove (ScratchPathManager.java:86)

Reproduced when using ScratchableLinearLayout inside Jetpack Compose via AndroidView.

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.18%. Comparing base (d255539) to head (c9ca291).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...om/jackpocket/scratchoff/ScratchoffController.java	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #144      +/-   ##
==========================================
+ Coverage   83.63%   84.18%   +0.55%     
==========================================
  Files          10       10              
  Lines         611      626      +15     
  Branches       76       78       +2     
==========================================
+ Hits          511      527      +16     
+ Misses         67       66       -1     
  Partials       33       33              

Flag	Coverage Δ
unit	84.18% <87.50%> (+0.55%)	⬆️

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[mattsilber]

<3