feat: migrate runtime backend to node server

src/App.tsx

@@ -94,18 +94,18 @@ export default function App() {
   };
 
   const handleContinueGame = () => {
-    persistence.continueSavedGame();
+    void persistence.continueSavedGame();
   };
 
   const handleStartNewGame = () => {
-    persistence.clearSavedGame();
+    void persistence.clearSavedGame();
     storyFlow.resetStoryState();
     resetGame();
   };
 
   const handleSaveAndExit = () => {
     const syncedGameState = syncGameStatePlayTime(gameState);
-    persistence.saveCurrentGame({
+    void persistence.saveCurrentGame({
       gameState: syncedGameState,
       bottomTab,
       currentStory: storyFlow.currentStory,