feat: Implement initial Process Scheduling Simulator application with core logic, algorithms, UI components, and project setup.

src/hooks/useLocalStorage.ts

@@ -0,0 +1,50 @@
+import { useState, useCallback } from "react";
+
+/**
+ * Generic hook for reading/writing typed values to localStorage.
+ *
+ * Returns [value, setValue, removeValue].
+ * Read/write errors are silently ignored.
+ */
+export function useLocalStorage<T>(
+  key: string,
+  initialValue: T,
+): readonly [T, (value: T | ((prev: T) => T)) => void, () => void] {
+  const [storedValue, setStoredValue] = useState<T>(() => {
+    try {
+      const item = window.localStorage.getItem(key);
+      return item !== null ? (JSON.parse(item) as T) : initialValue;
+    } catch {
+      return initialValue;
+    }
+  });
+
+  const setValue = useCallback(
+    (value: T | ((prev: T) => T)) => {
+      setStoredValue((prev) => {
+        const next =
+          typeof value === "function"
+            ? (value as (prev: T) => T)(prev)
+            : value;
+        try {
+          window.localStorage.setItem(key, JSON.stringify(next));
+        } catch {
+          // ignore write errors (e.g. private mode quota exceeded)
+        }
+        return next;
+      });
+    },
+    [key],
+  );
+
+  const removeValue = useCallback(() => {
+    try {
+      window.localStorage.removeItem(key);
+    } catch {
+      // ignore
+    }
+    setStoredValue(initialValue);
+  }, [key, initialValue]);
+
+  return [storedValue, setValue, removeValue] as const;
+}