feat(tarot): useTarotShuffle hook (Fisher-Yates + reversed 플래그) (T9)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/pages/tarot/hooks/useTarotShuffle.js

@@ -0,0 +1,25 @@
+import { useCallback, useState } from 'react';
+
+export function fisherYates(input) {
+  const a = [...input];
+  for (let i = a.length - 1; i > 0; i--) {
+    const j = Math.floor(Math.random() * (i + 1));
+    [a[i], a[j]] = [a[j], a[i]];
+  }
+  return a;
+}
+
+function buildShuffle(deck, size) {
+  return fisherYates(deck).slice(0, size).map((c) => ({
+    ...c,
+    reversed: Math.random() < 0.5,
+  }));
+}
+
+export function useTarotShuffle(deck, size = 16) {
+  const [slice, setSlice] = useState(() => buildShuffle(deck, size));
+  const reshuffle = useCallback(() => {
+    setSlice(buildShuffle(deck, size));
+  }, [deck, size]);
+  return { slice, reshuffle };
+}