Route dialog work directory picker through platform services

src/app_events.cpp

@@ -217,6 +217,16 @@ void App::pick_dir(std::function<void(std::string path)> callback)
     active_platform_services().pick_directory(std::move(callback));
 }
 
+bool App::supports_working_directory_picker() const
+{
+    return active_platform_services().supports_working_directory_picker();
+}
+
+std::string App::format_working_directory_path(std::string_view path) const
+{
+    return active_platform_services().format_working_directory_path(path);
+}
+
 void App::display_file(std::string path)
 {
     if (pp::app::plan_display_file(path) == pp::app::DisplayFileAction::ignore_empty_path)