feat: initialisation de ĞéoFlux — visualisation géographique Ğ1

- Carte Leaflet plein écran avec heatmap (OpenStreetMap, dark mode)
- Sélecteur de période 24h / 7j / 30j
- Panneau latéral : volume total, compteur de transactions, top 3 villes
- mockData.ts : 2 400 transactions simulées sur 24 villes FR/EU
- DataService.ts : abstraction prête pour branchement Subsquid/Ğ1v2
- Schémas Zod (g1.schema.ts) : validation runtime Duniter GVA + Cesium+
- Adaptateurs DuniterAdapter et CesiumAdapter (Ğ1v1, à migrer v2)
- Suite de tests Vitest : 43 tests, conformité schéma Ğ1 vérifiée

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/test/StatsPanel.test.tsx

@@ -0,0 +1,57 @@
+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { StatsPanel } from '../components/StatsPanel';
+import type { PeriodStats } from '../services/DataService';
+
+const mockStats: PeriodStats = {
+  totalVolume: 1234.56,
+  transactionCount: 42,
+  topCities: [
+    { name: 'Paris',    volume: 700, count: 20 },
+    { name: 'Lyon',     volume: 400, count: 15 },
+    { name: 'Bordeaux', volume: 134, count:  7 },
+  ],
+};
+
+describe('StatsPanel', () => {
+  it('shows loading skeletons when loading=true', () => {
+    const { container } = render(
+      <StatsPanel stats={null} loading={true} periodDays={7} />
+    );
+    const skeletons = container.querySelectorAll('.animate-pulse');
+    expect(skeletons.length).toBeGreaterThan(0);
+  });
+
+  it('displays the total volume when stats are available', () => {
+    render(<StatsPanel stats={mockStats} loading={false} periodDays={7} />);
+    expect(screen.getByText(/1\s*234/)).toBeInTheDocument();
+  });
+
+  it('displays the transaction count', () => {
+    render(<StatsPanel stats={mockStats} loading={false} periodDays={7} />);
+    expect(screen.getByText('42')).toBeInTheDocument();
+  });
+
+  it('renders exactly 3 top cities in correct order', () => {
+    render(<StatsPanel stats={mockStats} loading={false} periodDays={7} />);
+    const cities = ['Paris', 'Lyon', 'Bordeaux'];
+    cities.forEach((city) => expect(screen.getByText(city)).toBeInTheDocument());
+  });
+
+  it('shows "24 dernières heures" for periodDays=1', () => {
+    render(<StatsPanel stats={mockStats} loading={false} periodDays={1} />);
+    expect(screen.getByText(/24 dernières heures/i)).toBeInTheDocument();
+  });
+
+  it('shows "30 derniers jours" for periodDays=30', () => {
+    render(<StatsPanel stats={mockStats} loading={false} periodDays={30} />);
+    expect(screen.getByText(/30 derniers jours/i)).toBeInTheDocument();
+  });
+
+  it('does not crash with an empty topCities list', () => {
+    const emptyStats = { ...mockStats, topCities: [] };
+    expect(() =>
+      render(<StatsPanel stats={emptyStats} loading={false} periodDays={7} />)
+    ).not.toThrow();
+  });
+});