UX overhaul: motion animations, command palette, warm cinema theme

Add premium "Late Night Screening Room" experience with warm indigo/amber
palette, framer-motion spring animations, Cmd+K command palette with TMDB
search, keyboard shortcuts (G H, G S, ?, W, M, 1-5), sonner toasts with
optimistic updates, skeleton loading states, stats dashboard, search
autocomplete with filter tabs, cinematic backdrop with film grain, season
progress bars, and staggered card reveal animations throughout.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hooks/use-debounce.ts

@@ -0,0 +1,12 @@
+import { useEffect, useState } from "react";
+
+export function useDebounce<T>(value: T, delay: number): T {
+  const [debounced, setDebounced] = useState(value);
+
+  useEffect(() => {
+    const timer = setTimeout(() => setDebounced(value), delay);
+    return () => clearTimeout(timer);
+  }, [value, delay]);
+
+  return debounced;
+}