Optimize app message in/outbox sizes; truncate lastWatched before sending to watch (if needed)

src/c/main.c

@@ -375,7 +375,7 @@ static void init() {
 
 	// initialize pkjs
 	app_message_register_inbox_received(inbox_received_handler);
-	app_message_open(1024, 1536);
+	app_message_open(1536, 64);
 
 	// get sleep time (UNIX timestamp)
 	time_t end = time(NULL);