Add MockCoordTrans.h stub for CommonUnitTestsPlaceholder

- Created minimal stub to satisfy CMake configuration
- Required for BUILD_TESTING=ON builds

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt6-after/qt6-migrated-legatus/Lts/Common/CommonUnitTestsPlaceholder/mocks/MockCoordTrans.h

@@ -0,0 +1,19 @@
+// MockCoordTrans.h - Stub mock for CoordTrans functionality
+// This is a placeholder to allow builds without full CoordTrans implementation
+
+#ifndef MOCK_COORD_TRANS_H
+#define MOCK_COORD_TRANS_H
+
+#include <QString>
+#include <QPointF>
+
+// Minimal stub to satisfy linker requirements
+namespace LtsCoordTrans {
+    // Placeholder types
+    struct UtmCoordinate {
+        static UtmCoordinate fromMgrs(const QString&) { return UtmCoordinate(); }
+        QPointF geographic() const { return QPointF(); }
+    };
+}
+
+#endif // MOCK_COORD_TRANS_H