feat(lotto): DecisionCard + BulkPurchaseButton, BriefingTab 단일 화면 재구성

src/pages/lotto/components/decision/BulkPurchaseButton.jsx

@@ -0,0 +1,33 @@
+import { useState } from 'react';
+import { bulkPurchase } from '../../../../api';
+import { MODES } from './TierModeToggle';
+
+export default function BulkPurchaseButton({ drawNo, tierMode, onSuccess }) {
+    const [busy, setBusy] = useState(false);
+    const mode = MODES.find(m => m.key === tierMode) || MODES[0];
+
+    const onClick = async () => {
+        if (busy) return;
+        setBusy(true);
+        try {
+            await bulkPurchase({
+                draw_no: drawNo,
+                tier_mode: tierMode,
+                sets: mode.sets,
+                amount: mode.amount,
+            });
+            onSuccess?.();
+            alert(`${mode.sets}세트 구매 기록 완료!`);
+        } catch (e) {
+            alert(`구매 기록 실패: ${e?.message || e}`);
+        } finally {
+            setBusy(false);
+        }
+    };
+
+    return (
+        <button className="lc-btn lc-btn--prim" onClick={onClick} disabled={busy || !drawNo}>
+            {busy ? '저장 중...' : `이대로 ${mode.sets}세트 구매했음`}
+        </button>
+    );
+}

src/pages/lotto/components/decision/DecisionCard.jsx

@@ -0,0 +1,102 @@
+import { useEffect, useMemo, useState } from 'react';
+import RetrospectiveBox from './RetrospectiveBox';
+import TierModeToggle, { MODES } from './TierModeToggle';
+import TierSection from './TierSection';
+import BulkPurchaseButton from './BulkPurchaseButton';
+import './decision.css';
+
+const TIER_CHAIN = {
+    core: ['core'],
+    core_bonus: ['core', 'bonus'],
+    core_bonus_extended: ['core', 'bonus', 'extended'],
+    full: ['core', 'bonus', 'extended', 'pool'],
+};
+
+const STORAGE_KEY = 'lotto.tier_mode';
+
+export default function DecisionCard({ briefing, review, onPurchaseSuccess }) {
+    const [tierMode, setTierMode] = useState(() =>
+        localStorage.getItem(STORAGE_KEY) || 'core'
+    );
+
+    useEffect(() => {
+        localStorage.setItem(STORAGE_KEY, tierMode);
+    }, [tierMode]);
+
+    const visibleTiers = TIER_CHAIN[tierMode];
+
+    const totalSets = useMemo(
+        () => visibleTiers.reduce((sum, t) => sum + (briefing?.picks?.[t]?.length || 0), 0),
+        [briefing, visibleTiers]
+    );
+
+    // 분배 칩 — 보이는 계층의 risk_tag 합산
+    const balance = useMemo(() => {
+        const acc = { '안정': 0, '균형': 0, '공격': 0 };
+        for (const t of visibleTiers) {
+            for (const p of (briefing?.picks?.[t] || [])) {
+                if (acc[p.risk_tag] !== undefined) acc[p.risk_tag]++;
+            }
+        }
+        return acc;
+    }, [briefing, visibleTiers]);
+
+    if (!briefing) return null;
+
+    let cursor = 0;
+
+    return (
+        <div className="lc-card">
+            <header className="lc-head">
+                <div>
+                    <p className="lc-eyebrow">Curator Briefing · {briefing.draw_no}회</p>
+                    <h3 className="lc-title">{briefing.narrative.headline}</h3>
+                </div>
+                <div className="lc-conf">
+                    <div className="lc-conf__num">{briefing.confidence}</div>
+                    <div className="lc-conf__lbl">CONFIDENCE</div>
+                </div>
+            </header>
+
+            <RetrospectiveBox briefing={briefing} review={review} />
+
+            <p className="lc-headline-3">
+                {(briefing.narrative.summary_3lines || []).join(' · ')}
+            </p>
+
+            <div className="lc-balance">
+                <div className="lc-balance__chips">
+                    {balance['안정'] > 0 && <span className="lc-chip lc-chip--stable">안정 ×{balance['안정']}</span>}
+                    {balance['균형'] > 0 && <span className="lc-chip lc-chip--balance">균형 ×{balance['균형']}</span>}
+                    {balance['공격'] > 0 && <span className="lc-chip lc-chip--aggro">공격 ×{balance['공격']}</span>}
+                </div>
+            </div>
+
+            <TierModeToggle value={tierMode} onChange={setTierMode} />
+
+            {visibleTiers.map(tier => {
+                const picks = briefing.picks?.[tier] || [];
+                const idxBase = cursor;
+                cursor += picks.length;
+                return (
+                    <TierSection
+                        key={tier}
+                        tier={tier}
+                        picks={picks}
+                        rationale={briefing.tier_rationale?.[tier]}
+                        indexBase={idxBase}
+                        totalSets={totalSets}
+                    />
+                );
+            })}
+
+            <div className="lc-actions">
+                <BulkPurchaseButton
+                    drawNo={briefing.draw_no}
+                    tierMode={tierMode}
+                    onSuccess={onPurchaseSuccess}
+                />
+            </div>
+        </div>
+    );
+}

src/pages/lotto/components/decision/decision.css

@@ -42,6 +42,11 @@
 .lc-balls { display: flex; gap: 6px; margin-bottom: 8px; flex-wrap: wrap; }
 .lc-set__reason { font-size: 12px; opacity: 0.7; line-height: 1.45; margin: 0; }
 .lc-actions { display: flex; gap: 10px; margin-top: 18px; }
+.lc-btn { padding: 12px 16px; border-radius: 10px; border: none; font-weight: 600; cursor: pointer;
+  font-size: 14px; min-width: 160px; }
+.lc-btn--prim { background: linear-gradient(135deg, #b8a8ff, #8a78db); color: #14101e; }
+.lc-btn--prim:disabled { opacity: 0.5; cursor: not-allowed; }
+.lc-btn--ghost { background: transparent; border: 1px solid rgba(255,255,255,0.15); color: #ece6f7; }
 @media (max-width: 480px) {
   .lc-toggle { grid-template-columns: repeat(2, 1fr); }
 }

src/pages/lotto/tabs/BriefingTab.jsx

@@ -1,25 +1,18 @@
 import useBriefing from '../hooks/useBriefing';
-import BriefingHeader from '../components/briefing/BriefingHeader';
+import useReview from '../hooks/useReview';
-import BriefingSummary from '../components/briefing/BriefingSummary';
+import DecisionCard from '../components/decision/DecisionCard';
-import PickSetCard from '../components/briefing/PickSetCard';
 import BriefingEmpty from '../components/briefing/BriefingEmpty';
-import CuratorUsageFooter from '../components/briefing/CuratorUsageFooter';
 
 export default function BriefingTab() {
     const { briefing, loading, error, regenerating, regenerate } = useBriefing();
+    const { latest: review } = useReview();
 
     if (loading) return <div className="briefing-empty"><p>로딩 중...</p></div>;
     if (!briefing) return <BriefingEmpty regenerating={regenerating} onRegenerate={regenerate} error={error} />;
 
     return (
         <div className="briefing-tab">
-            <BriefingHeader briefing={briefing} regenerating={regenerating} onRegenerate={regenerate} />
+            <DecisionCard briefing={briefing} review={review} />
-            <BriefingSummary narrative={briefing.narrative} />
-            <div className="briefing-picks">
-                <h3>이번 주 5세트</h3>
-                {briefing.picks.map((p, i) => <PickSetCard key={i} pick={p} index={i} />)}
-            </div>
-            <CuratorUsageFooter />
         </div>
     );
 }