Switch to OTA app if an unexpected error occurs

src/main.cpp

@@ -186,10 +186,14 @@ void loop()
     } else if (M5.BtnC.wasClicked()) {
         next = App::Text;
     }
+    try {
         if (next != current_app) {
             switch_app(next);
         } else {
             app->loop();
         }
+    } catch (...) {
+        switch_app(App::OTA);
+    }
     yield();
 }