Initial commit: CI Agent competitive-intelligence monitoring app

FastAPI + Celery + Next.js + Postgres/Redis app with company monitoring,
source collection, LLM-based change analysis, enrichment, and account
security (Turnstile, escalating lockout, email verification).

apps/web/hooks/use-countdown.ts

@@ -0,0 +1,17 @@
+"use client";
+
+import { useEffect, useState } from "react";
+
+/** A countdown in whole seconds, started on demand via `start(seconds)` -
+ * drives the "Resend in Ns" button state after a 429 throttle response. */
+export function useCountdown() {
+  const [remaining, setRemaining] = useState(0);
+
+  useEffect(() => {
+    if (remaining <= 0) return;
+    const timer = setTimeout(() => setRemaining((s) => Math.max(0, s - 1)), 1000);
+    return () => clearTimeout(timer);
+  }, [remaining]);
+
+  return { remaining, start: (seconds: number) => setRemaining(seconds) };
+}