Fixes and improvements (#616)

Tactility/Private/Tactility/app/apphub/AppHubEntry.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <TactilityCpp/Allocator.h>
+
 #include <string>
 #include <vector>
 
@@ -16,6 +18,10 @@ struct AppHubEntry {
     std::string file;
 };
 
-bool parseJson(const std::string& filePath, std::vector<AppHubEntry>& entries);
+// The top-level entries buffer prefers PSRAM/SPIRAM via OptExternalAllocator; individual
+// AppHubEntry string/vector members still use the default (internal-RAM) allocator.
+using AppHubEntryList = std::vector<AppHubEntry, OptExternalAllocator<AppHubEntry>>;
+
+bool parseJson(const std::string& filePath, AppHubEntryList& entries);
 
 }