feat: initial release - MorkNetVizualiser v1.0

frontend/src/useLocalStorage.js

@@ -0,0 +1,22 @@
+import { useState, useCallback } from 'react';
+
+export function useLocalStorage(key, defaultValue) {
+  const [value, setValueState] = useState(() => {
+    try {
+      const stored = localStorage.getItem(key);
+      return stored !== null ? JSON.parse(stored) : defaultValue;
+    } catch {
+      return defaultValue;
+    }
+  });
+
+  const setValue = useCallback((newVal) => {
+    setValueState(prev => {
+      const next = typeof newVal === 'function' ? newVal(prev) : newVal;
+      try { localStorage.setItem(key, JSON.stringify(next)); } catch {}
+      return next;
+    });
+  }, [key]);
+
+  return [value, setValue];
+}