feat(app): add persistence of settings across sessions

src/hooks/usePersistSettings.ts

@@ -0,0 +1,18 @@
+import { useRecoilValue } from "recoil";
+import useDebounce from "./useDebounce";
+import { iconWeightAtom, iconSizeAtom, iconColorAtom } from "../state/atoms";
+
+export default function usePersistSettings() {
+  const weight = useRecoilValue(iconWeightAtom);
+  const size = useRecoilValue(iconSizeAtom);
+  const color = useRecoilValue(iconColorAtom);
+
+  useDebounce(
+    () => {
+      const serializedState = JSON.stringify({ weight, size, color });
+      window.localStorage.setItem("__phosphor_settings__", serializedState);
+    },
+    2000,
+    [weight, size, color]
+  );
+}