feat(stock): /stock/screener 페이지 골격 + hooks 4개 + 컴포넌트 stub 6개

src/pages/stock/screener/components/TelegramPreview.jsx

@@ -0,0 +1,9 @@
+export default function TelegramPreview({ payload }) {
+  if (!payload) return null;
+  return (
+    <section className="screener-card">
+      <h3>텔레그램 미리보기</h3>
+      <pre style={{whiteSpace:'pre-wrap', fontFamily:'monospace', fontSize:12}}>{payload.text}</pre>
+    </section>
+  );
+}