diff --git a/src/renderer/inbox/components/PromotionBanner.tsx b/src/renderer/inbox/components/PromotionBanner.tsx
new file mode 100644
index 0000000..7f9c15e
--- /dev/null
+++ b/src/renderer/inbox/components/PromotionBanner.tsx
@@ -0,0 +1,78 @@
+import React, { useState } from 'react';
+import { useInbox } from '../store.js';
+import { Banner } from './Banner.js';
+
+const COLOR_PALETTE = ['#0a4b80', '#236b1a', '#946100', '#a55', '#5a3a8c'];
+
+export function PromotionBanner(): React.ReactElement | null {
+  const candidates = useInbox((s) => s.promotionCandidates);
+  const accept = useInbox((s) => s.acceptPromotion);
+  const snooze = useInbox((s) => s.snoozePromotion);
+  const dismiss = useInbox((s) => s.dismissPromotion);
+  const [editing, setEditing] = useState<{ tag: string; name: string; color: string } | null>(null);
+
+  if (candidates.length === 0) return null;
+  const c = candidates[0]!;
+
+  return (
+    <Banner severity="info">
+      {editing === null ? (
+        <div style={{ display: 'flex', alignItems: 'center', gap: 8, flexWrap: 'wrap' }}>
+          <span>💡 <code>{c.tag}</code> 관련 노트 {c.noteIds.length}개가 모였어요. 새 노트북 <b>{c.suggestedName}</b> 로 분리할까요?</span>
+          <div style={{ display: 'flex', gap: 6, marginLeft: 'auto' }}>
+            <button
+              onClick={() => setEditing({ tag: c.tag, name: c.suggestedName, color: COLOR_PALETTE[0]! })}
+              style={{ background: '#0a4b80', color: '#fff', border: 'none', borderRadius: 4, padding: '4px 12px', fontSize: 12, cursor: 'pointer' }}
+            >
+              수락
+            </button>
+            <button
+              onClick={() => { void snooze(); }}
+              style={{ background: 'transparent', color: '#234', border: '1px solid #ccc', borderRadius: 4, padding: '4px 12px', fontSize: 12, cursor: 'pointer' }}
+            >
+              나중에
+            </button>
+            <button
+              onClick={() => { void dismiss(c.tag); }}
+              style={{ background: 'transparent', color: '#888', border: 'none', cursor: 'pointer', fontSize: 12 }}
+            >
+              숨기기
+            </button>
+          </div>
+        </div>
+      ) : (
+        <div style={{ display: 'flex', alignItems: 'center', gap: 8, flexWrap: 'wrap' }}>
+          <input
+            aria-label="노트북 이름"
+            value={editing.name}
+            onChange={(e) => setEditing({ ...editing, name: e.target.value })}
+            style={{ flex: 1, fontSize: 13, padding: '4px 8px', border: '1px solid #ccc', borderRadius: 4, minWidth: 120 }}
+            autoFocus
+          />
+          <div style={{ display: 'flex', gap: 4 }}>
+            {COLOR_PALETTE.map((col) => (
+              <button
+                key={col}
+                onClick={() => setEditing({ ...editing, color: col })}
+                aria-label={`색 ${col}`}
+                style={{
+                  width: 20, height: 20, borderRadius: '50%', background: col,
+                  border: col === editing.color ? '2px solid #333' : '1px solid #ccc',
+                  cursor: 'pointer', padding: 0
+                }}
+              />
+            ))}
+          </div>
+          <button
+            onClick={() => { void accept(editing.tag, editing.name.trim(), editing.color); setEditing(null); }}
+            disabled={editing.name.trim().length === 0}
+            style={{ background: '#0a4b80', color: '#fff', border: 'none', borderRadius: 4, padding: '4px 12px', fontSize: 12, cursor: 'pointer' }}
+          >
+            만들기
+          </button>
+          <button onClick={() => setEditing(null)} style={{ fontSize: 12, padding: '4px 10px' }}>취소</button>
+        </div>
+      )}
+    </Banner>
+  );
+}
diff --git a/tests/unit/PromotionBanner.test.tsx b/tests/unit/PromotionBanner.test.tsx
new file mode 100644
index 0000000..f5ba6bc
--- /dev/null
+++ b/tests/unit/PromotionBanner.test.tsx
@@ -0,0 +1,81 @@
+// @vitest-environment jsdom
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import '@testing-library/jest-dom/vitest';
+import { render, screen, fireEvent, cleanup } from '@testing-library/react';
+
+const accept = vi.fn(async () => {});
+const snooze = vi.fn(async () => {});
+const dismiss = vi.fn(async () => {});
+
+let mockState: {
+  promotionCandidates: Array<{ tag: string; noteIds: string[]; suggestedName: string }>;
+  acceptPromotion: typeof accept;
+  snoozePromotion: typeof snooze;
+  dismissPromotion: typeof dismiss;
+} = {
+  promotionCandidates: [],
+  acceptPromotion: accept,
+  snoozePromotion: snooze,
+  dismissPromotion: dismiss
+};
+
+vi.mock('../../src/renderer/inbox/store.js', () => ({
+  useInbox: (selector?: (s: typeof mockState) => unknown) => selector ? selector(mockState) : mockState
+}));
+
+import { PromotionBanner } from '../../src/renderer/inbox/components/PromotionBanner';
+
+describe('PromotionBanner', () => {
+  beforeEach(() => {
+    cleanup();
+    accept.mockClear(); snooze.mockClear(); dismiss.mockClear();
+    mockState = {
+      promotionCandidates: [],
+      acceptPromotion: accept,
+      snoozePromotion: snooze,
+      dismissPromotion: dismiss
+    };
+  });
+
+  it('candidates 비어있으면 null', () => {
+    const { container } = render(<PromotionBanner />);
+    expect(container.firstChild).toBeNull();
+  });
+
+  it('첫 candidate 의 tag/suggestedName 표시', () => {
+    mockState.promotionCandidates = [{ tag: 'mlx-ops', noteIds: ['n1', 'n2', 'n3'], suggestedName: 'Mlx Ops' }];
+    render(<PromotionBanner />);
+    expect(screen.getByText('mlx-ops')).toBeInTheDocument();
+    expect(screen.getByText('Mlx Ops')).toBeInTheDocument();
+  });
+
+  it('수락 클릭 → 편집 모드 → 만들기 → acceptPromotion 호출', () => {
+    mockState.promotionCandidates = [{ tag: 'mlx-ops', noteIds: ['n1', 'n2', 'n3'], suggestedName: 'Mlx Ops' }];
+    render(<PromotionBanner />);
+    fireEvent.click(screen.getByRole('button', { name: '수락' }));
+    fireEvent.click(screen.getByRole('button', { name: '만들기' }));
+    expect(accept).toHaveBeenCalledWith('mlx-ops', 'Mlx Ops', expect.any(String));
+  });
+
+  it('나중에 클릭 → snoozePromotion 호출', () => {
+    mockState.promotionCandidates = [{ tag: 'mlx-ops', noteIds: ['n1', 'n2', 'n3'], suggestedName: 'Mlx Ops' }];
+    render(<PromotionBanner />);
+    fireEvent.click(screen.getByRole('button', { name: '나중에' }));
+    expect(snooze).toHaveBeenCalled();
+  });
+
+  it('숨기기 클릭 → dismissPromotion(tag) 호출', () => {
+    mockState.promotionCandidates = [{ tag: 'mlx-ops', noteIds: ['n1', 'n2', 'n3'], suggestedName: 'Mlx Ops' }];
+    render(<PromotionBanner />);
+    fireEvent.click(screen.getByRole('button', { name: '숨기기' }));
+    expect(dismiss).toHaveBeenCalledWith('mlx-ops');
+  });
+
+  it('편집 모드: 이름 빈 시 만들기 disabled', () => {
+    mockState.promotionCandidates = [{ tag: 'mlx-ops', noteIds: ['n1', 'n2', 'n3'], suggestedName: 'Mlx Ops' }];
+    render(<PromotionBanner />);
+    fireEvent.click(screen.getByRole('button', { name: '수락' }));
+    fireEvent.change(screen.getByLabelText('노트북 이름'), { target: { value: '' } });
+    expect(screen.getByRole('button', { name: '만들기' })).toBeDisabled();
+  });
+});