Implement native opening scenes, battle foundation and overworld movement

src/reference/main.ts

@@ -1,4 +1,4 @@
-import "../ui/styles.css";
+import "../ui/reference.css";
 import { renderShell } from "./shell";
 import { BinjgbEmulator } from "../emulator/binjgb";
 import { GameSession } from "../app/session";