Rhythm Selection & Cleanup

include/vamp_zero/portal.hpp

@@ -37,5 +37,6 @@ private:
 
 auto make_router(vamp_zero::control_state &state) -> ligo::service_router;
 auto portal_status_json(vamp_zero::config const &config, vamp_zero::app_state const &state) -> boost::json::value;
+auto validated_title_path(std::string const &assets_path, std::string const &identifier) -> std::expected<std::string, modulus::error>;
 
 }

include/vamp_zero/types.hpp

@@ -40,6 +40,7 @@ struct library_part {
   std::string source_path{};
   std::size_t measure_count{};
   std::size_t total_pages{};
+  std::string title_image{};
 };
 
 struct song_group {