BaseUI: Autosave Messages (#9269)

* Autosave Messages

* fix

* Add logging, code cleanup, and add save on delete.

* We already save as part of delete messages, no need to do it again

* fix spelling errors

* Updating comment

---------

Co-authored-by: Jason P <applewiz@mac.com>

src/MessageStore.h

@@ -125,6 +125,11 @@ class MessageStore
     std::string filename;                   // Flash filename for persistence
 };
 
+#if ENABLE_MESSAGE_PERSISTENCE
+// Called periodically from main loop to trigger time based autosave
+void messageStoreAutosaveTick();
+#endif
+
 // Global instance (defined in MessageStore.cpp)
 extern MessageStore messageStore;