Fix misleading variable name in test

Co-authored-by: RuntimeRascal <2422222+RuntimeRascal@users.noreply.github.com>

Author: Copilot

Tests/GhostDraw.Tests/ClearCanvasFeatureTests.cs

@@ -64,8 +64,8 @@ public void GlobalKeyboardHook_Dispose_ShouldNotThrowWithClearCanvasEvent()
     {
         // Arrange
         var hook = new GlobalKeyboardHook(_mockLogger.Object);
-        var disposed = false;
-        hook.ClearCanvasPressed += (s, e) => { disposed = !disposed; };
+        var eventHandled = false;
+        hook.ClearCanvasPressed += (s, e) => { eventHandled = !eventHandled; };
 
         // Act & Assert - Dispose should work without throwing
         var exception = Record.Exception(() => hook.Dispose());