Plan PPBR export reporting

src/app_core/brush_package_export.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "app_core/app_dialog.h"
 #include "foundation/result.h"
 
 #include <string>
@@ -33,6 +34,13 @@ public:
     return pp::foundation::Status::success();
 }
 
+[[nodiscard]] inline AppMessageDialogPlan plan_brush_package_export_success_dialog(std::string_view path)
+{
+    std::string message = "Brushes exported to:\n";
+    message += path;
+    return plan_app_message_dialog("Export PPBR", message, false);
+}
+
 [[nodiscard]] inline pp::foundation::Status validate_brush_package_export_request(
     std::string_view path,
     const BrushPackageExportRequest& request) noexcept