first commit

mobile/src/router.tsx

@@ -0,0 +1,26 @@
+import React, { createContext, useContext, useState } from "react";
+
+export type Route = "home" | "mystery";
+
+interface RouterContextValue {
+  route: Route;
+  navigate: (to: Route) => void;
+}
+
+const RouterContext = createContext<RouterContextValue | null>(null);
+
+export function RouterProvider({ children }: { children: React.ReactNode }) {
+  const [route, setRoute] = useState<Route>("home");
+
+  return (
+    <RouterContext.Provider value={{ route, navigate: setRoute }}>
+      {children}
+    </RouterContext.Provider>
+  );
+}
+
+export function useRouter(): RouterContextValue {
+  const ctx = useContext(RouterContext);
+  if (!ctx) throw new Error("useRouter must be used inside <RouterProvider>");
+  return ctx;
+}