AJ Isaacs 640814fdf6 fix: marshal timer callbacks to UI thread to prevent GDI+ threading exception ...

System.Timers.Timer fires on thread pool threads, causing GraphicsPath
objects to be accessed concurrently by hover detection and OnPaint,
triggering "Object is currently in use elsewhere" in DrawParts.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-09 10:41:18 -04:00

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