feat(listings): 매물 목록 탭(필터·판정 tier·수집) + 스모크 테스트

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UHXzpsZQxKG9hQmNRfZjRS

src/pages/listings/components/ListingsTab.test.jsx

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+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { render, screen, waitFor } from '@testing-library/react';
+
+vi.mock('../../../api', () => ({
+  getListings: vi.fn(),
+  collectListings: vi.fn(),
+  getListingsCollectStatus: vi.fn(),
+}));
+import { getListings, getListingsCollectStatus } from '../../../api';
+import ListingsTab from './ListingsTab.jsx';
+
+beforeEach(() => {
+  vi.clearAllMocks();
+  getListingsCollectStatus.mockResolvedValue({ status: 'never_run' });
+});
+
+describe('ListingsTab', () => {
+  it('빈 목록이면 안내 문구', async () => {
+    getListings.mockResolvedValue({ listings: [] });
+    render(<ListingsTab />);
+    await waitFor(() => expect(screen.getByText(/매물이 없습니다|수집/)).toBeInTheDocument());
+  });
+
+  it('매물+판정 tier·배열 필드를 크래시 없이 렌더 (매매=valuation, 배열 그대로)', async () => {
+    getListings.mockResolvedValue({ listings: [{
+      id: 1, complex_name: '상도더샵', dong: '상도동', deal_type: '매매',
+      price: 95000, valuation_tier: '고가', ratio: 1.08,
+      regulation_flags: ['토지거래허가'], reasons: ['호가가 최근 실거래 대비 8% 높음'],
+    }] });
+    render(<ListingsTab />);
+    await waitFor(() => expect(screen.getByText('상도더샵')).toBeInTheDocument());
+    expect(screen.getByText(/고가/)).toBeInTheDocument();
+    expect(screen.getByText('토지거래허가')).toBeInTheDocument();
+    expect(screen.getByText(/호가가 최근 실거래/)).toBeInTheDocument();
+  });
+});