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

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

@@ -0,0 +1,10 @@
+export default function GlobalControls({ settings, setSettings, onRun, onSave, onPersist, dirty, running }) {
+  return (
+    <section className="screener-card">
+      <h3>실행 옵션</h3>
+      <button onClick={onRun} disabled={running}>{running ? '실행 중…' : '지금 실행 (미리보기)'}</button>
+      <button onClick={onSave} disabled={running} style={{ marginTop: 8 }}>스냅샷 저장</button>
+      <button onClick={onPersist} disabled={!dirty} style={{ marginTop: 8 }}>설정 저장</button>
+    </section>
+  );
+}