fix: replaced isMobile with mantine hook

src/hooks/useIsMobile.ts

@@ -0,0 +1,8 @@
+import { em } from "@mantine/core";
+import { useMediaQuery } from "@mantine/hooks";
+
+const useIsMobile = () => {
+    return useMediaQuery(`(max-width: ${em(750)})`);
+};
+
+export default useIsMobile;