init commit

src/hooks/useTheme.js

@@ -0,0 +1,10 @@
+import { useContext } from "react";
+import { ThemeContext } from "../context/ThemeContext";
+
+export const useTheme = () => {
+  const context = useContext(ThemeContext);
+  if (!context) {
+    throw new Error("useTheme debe usarse dentro de un <ThemeProvider>");
+  }
+  return context;
+};