Minor: Add Asian Pokemon Card Support (#18)

ui_wx/include/ccm/ui/VariantImagePreviewDialog.hpp

@@ -0,0 +1,45 @@
+#pragma once
+
+// VariantImagePreviewDialog: small modeless popup that shows a single card
+// preview image (bytes decoded as wxImage). Used by Japanese Pokémon Add/Edit
+// when cycling UnnumberedPromo prints. Prev/Next fire custom events so the
+// edit dialog owns the variant ring.
+
+#include <wx/button.h>
+#include <wx/dialog.h>
+#include <wx/event.h>
+#include <wx/image.h>
+#include <wx/panel.h>
+#include <wx/stattext.h>
+#include <wx/string.h>
+
+#include <string_view>
+
+namespace ccm::ui {
+
+wxDECLARE_EVENT(EVT_VARIANT_PREVIEW_PREV, wxCommandEvent);
+wxDECLARE_EVENT(EVT_VARIANT_PREVIEW_NEXT, wxCommandEvent);
+
+class VariantImagePreviewDialog : public wxDialog {
+public:
+    explicit VariantImagePreviewDialog(wxWindow* parent);
+
+    void setCaption(const wxString& caption);
+    void setImageBytes(std::string_view bytes);
+    void clearImage();
+    void setNavigationEnabled(bool enabled);
+    void repositionBesideParent();
+
+private:
+    class ImageCanvas;
+
+    void onPrev(wxCommandEvent&);
+    void onNext(wxCommandEvent&);
+
+    ImageCanvas*  imageHost_{nullptr};
+    wxStaticText* caption_{nullptr};
+    wxButton*     prevButton_{nullptr};
+    wxButton*     nextButton_{nullptr};
+};
+
+}  // namespace ccm::ui