extract auth to lib

src/hooks/useCooldownTimer.ts

@@ -0,0 +1,28 @@
+import { useCallback, useEffect, useState } from 'react';
+
+export function useCooldownTimer(seconds = 0, enabled = true) {
+  const [cooldown, setCooldown] = useState(seconds);
+
+  useEffect(() => {
+    if (!enabled || cooldown <= 0) {
+      return;
+    }
+
+    const timer = globalThis.setInterval(() => {
+      setCooldown((prev) => (prev > 0 ? prev - 1 : 0));
+    }, 1000);
+
+    return () => {
+      globalThis.clearInterval(timer);
+    };
+  }, [enabled, cooldown]);
+
+  const startCooldown = useCallback((seconds: number) => {
+    setCooldown(Math.max(0, Math.floor(seconds)));
+  }, []);
+
+  return {
+    cooldown,
+    startCooldown
+  };
+}