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

src/pages/stock/screener/hooks/useScreenerSettings.js

@@ -0,0 +1,26 @@
+import { useEffect, useState } from 'react';
+import { getScreenerSettings, saveScreenerSettings } from '../../../../api';
+
+export function useScreenerSettings() {
+  const [remote, setRemote] = useState(null);
+  const [local, setLocal] = useState(null);
+
+  useEffect(() => {
+    getScreenerSettings().then((s) => { setRemote(s); setLocal(s); });
+  }, []);
+
+  const dirty = remote && local && JSON.stringify(remote) !== JSON.stringify(local);
+
+  async function save() {
+    if (!local) return;
+    const saved = await saveScreenerSettings({
+      weights: local.weights, node_params: local.node_params, gate_params: local.gate_params,
+      top_n: local.top_n, rr_ratio: local.rr_ratio,
+      atr_window: local.atr_window, atr_stop_mult: local.atr_stop_mult,
+    });
+    setRemote(saved);
+    setLocal(saved);
+  }
+
+  return { settings: local, dirty, setLocal, save };
+}