Fixed a memory alignment issue that caused the measure tool to crash on some machines. (#41556)

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## Summary of the Pull Request
The EXCEPTION_DATATYPE_MISALIGNMENT error is a classic memory alignment
issue, and add alignas(8) to Ensures cursorPosSystemSpace is aligned on
an 8-byte boundary

This happened on the pipeline’s ARM64 UI test machine.

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## PR Checklist

- [x] Closes: #41555
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src/modules/MeasureTool/MeasureToolCore/ToolState.h

@@ -31,7 +31,11 @@ struct CommonState
 
     Measurement::Unit units = Measurement::Unit::Pixel;
 
-    POINT cursorPosSystemSpace = {}; // updated atomically
+    #pragma warning(push)
+    #pragma warning(disable : 4324)
+    alignas(8) POINT cursorPosSystemSpace = {}; // updated atomically
+    #pragma warning(pop)
+
     std::atomic_bool closeOnOtherMonitors = false;
 
     float GetPhysicalPx2MmRatio(HWND window) const