diff --git a/app/factory.py b/app/factory.py
index 293bc10..51fbe97 100644
--- a/app/factory.py
+++ b/app/factory.py
@@ -84,6 +84,23 @@ def create_app() -> FastAPI:
             return FileResponse(favicon_path)
         return FileResponse(settings.base_dir / "favicon.ico")
 
+    @app.get("/manifest.json", include_in_schema=False)
+    async def manifest():
+        """Serve le Web App Manifest pour la PWA."""
+        return FileResponse(
+            settings.base_dir / "static" / "manifest.json",
+            media_type="application/manifest+json",
+        )
+
+    @app.get("/sw.js", include_in_schema=False)
+    async def service_worker():
+        """Serve le Service Worker à la racine pour un scope maximal."""
+        return FileResponse(
+            settings.base_dir / "static" / "sw.js",
+            media_type="application/javascript",
+            headers={"Service-Worker-Allowed": "/"},
+        )
+
     @app.get("/api", response_class=HTMLResponse)
     async def api_home():
         """Page d'accueil de l'API."""
diff --git a/app/index.html b/app/index.html
index 3a9d511..5138f5f 100644
--- a/app/index.html
+++ b/app/index.html
@@ -10,6 +10,13 @@
     <link href="https://cdn.jsdelivr.net/npm/@splidejs/splide@4.1.4/dist/css/splide.min.css" rel="stylesheet">
     <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap" rel="stylesheet">
     <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css" rel="stylesheet">
+
+    <!-- PWA -->
+    <link rel="manifest" href="/manifest.json">
+    <meta name="theme-color" content="#7c3aed">
+    <meta name="apple-mobile-web-app-capable" content="yes">
+    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
+    <link rel="apple-touch-icon" href="/static/icons/icon-192x192.png">
     
     <style>
         :root {
@@ -6056,5 +6063,16 @@
     
     <!-- CodeMirror Editor Bundle -->
     <script src="/static/codemirror-editor.js"></script>
+
+    <!-- PWA Service Worker Registration -->
+    <script>
+    if ('serviceWorker' in navigator) {
+        navigator.serviceWorker.register('/sw.js').then(function(reg) {
+            console.log('SW registered:', reg.scope);
+        }).catch(function(err) {
+            console.warn('SW registration failed:', err);
+        });
+    }
+    </script>
 </body>
 </html>
\ No newline at end of file
diff --git a/app/main.js b/app/main.js
index 8970b04..996f0e9 100644
--- a/app/main.js
+++ b/app/main.js
@@ -89,6 +89,7 @@ class DashboardManager {
 
         // WebSocket
         this.ws = null;
+        this.wsReconnectDelay = 1000;
 
         this.debugModeEnabled = false;
 
@@ -722,6 +723,7 @@ class DashboardManager {
             this.setDebugBadgeVisible(this.isDebugEnabled());
             await this.loadAllData();
             this.connectWebSocket();
+            this.initNetworkListeners();
             this.startRunningTasksPolling();
 
             this.showNotification('Connexion réussie', 'success');
@@ -1006,7 +1008,40 @@ class DashboardManager {
 
     // ===== WEBSOCKET =====
 
+    initNetworkListeners() {
+        window.addEventListener('online', () => {
+            console.log('Réseau rétabli — reconnexion WebSocket...');
+            this.hideOfflineBanner();
+            this.wsReconnectDelay = 1000;
+            this.connectWebSocket();
+        });
+        window.addEventListener('offline', () => {
+            console.log('Réseau perdu — mode hors ligne');
+            this.showOfflineBanner();
+        });
+    }
+
+    showOfflineBanner() {
+        if (document.getElementById('offline-banner')) return;
+        const banner = document.createElement('div');
+        banner.id = 'offline-banner';
+        banner.style.cssText = 'position:fixed;top:0;left:0;right:0;z-index:9999;background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff;text-align:center;padding:8px 16px;font-size:14px;font-weight:500;font-family:Inter,sans-serif;box-shadow:0 2px 8px rgba(0,0,0,0.3);';
+        banner.innerHTML = '<i class="fas fa-wifi" style="margin-right:8px;opacity:0.8"></i>Hors ligne — les données seront rafraîchies au retour du réseau';
+        document.body.prepend(banner);
+    }
+
+    hideOfflineBanner() {
+        const banner = document.getElementById('offline-banner');
+        if (banner) banner.remove();
+    }
+
     connectWebSocket() {
+        // Don't attempt to connect while offline
+        if (typeof navigator !== 'undefined' && !navigator.onLine) {
+            console.log('Hors ligne — connexion WebSocket reportée');
+            return;
+        }
+
         const wsProtocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
         const wsUrl = `${wsProtocol}//${window.location.host}/ws`;
 
@@ -1015,6 +1050,7 @@ class DashboardManager {
 
             this.ws.onopen = () => {
                 console.log('WebSocket connecté');
+                this.wsReconnectDelay = 1000; // Reset backoff on success
             };
 
             this.ws.onmessage = (event) => {
@@ -1023,8 +1059,11 @@ class DashboardManager {
             };
 
             this.ws.onclose = () => {
-                console.log('WebSocket déconnecté, reconnexion dans 5s...');
-                setTimeout(() => this.connectWebSocket(), 5000);
+                const delay = this.wsReconnectDelay || 1000;
+                console.log(`WebSocket déconnecté, reconnexion dans ${delay / 1000}s...`);
+                setTimeout(() => this.connectWebSocket(), delay);
+                // Exponential backoff: 1s → 2s → 4s → 8s → 16s → 30s max
+                this.wsReconnectDelay = Math.min((delay) * 2, 30000);
             };
 
             this.ws.onerror = (error) => {
diff --git a/app/static/icons/icon-192x192.png b/app/static/icons/icon-192x192.png
new file mode 100644
index 0000000..3d742ad
Binary files /dev/null and b/app/static/icons/icon-192x192.png differ
diff --git a/app/static/icons/icon-512x512.png b/app/static/icons/icon-512x512.png
new file mode 100644
index 0000000..9acf21d
Binary files /dev/null and b/app/static/icons/icon-512x512.png differ
diff --git a/app/static/manifest.json b/app/static/manifest.json
new file mode 100644
index 0000000..de3b4b4
--- /dev/null
+++ b/app/static/manifest.json
@@ -0,0 +1,30 @@
+{
+    "name": "Homelab Automation Dashboard",
+    "short_name": "Homelab",
+    "description": "Dashboard de gestion automatisée de homelab avec Ansible",
+    "start_url": "/",
+    "display": "standalone",
+    "orientation": "any",
+    "theme_color": "#7c3aed",
+    "background_color": "#0a0a0a",
+    "icons": [
+        {
+            "src": "/static/icons/icon-192x192.png",
+            "sizes": "192x192",
+            "type": "image/png",
+            "purpose": "any maskable"
+        },
+        {
+            "src": "/static/icons/icon-512x512.png",
+            "sizes": "512x512",
+            "type": "image/png",
+            "purpose": "any maskable"
+        }
+    ],
+    "categories": [
+        "utilities",
+        "productivity"
+    ],
+    "lang": "fr",
+    "dir": "ltr"
+}
\ No newline at end of file
diff --git a/app/static/sw.js b/app/static/sw.js
new file mode 100644
index 0000000..f87d613
--- /dev/null
+++ b/app/static/sw.js
@@ -0,0 +1,160 @@
+// ============================================================================
+// Service Worker — Homelab Automation Dashboard PWA
+// ============================================================================
+
+const CACHE_VERSION = 'v1';
+const STATIC_CACHE = `homelab-static-${CACHE_VERSION}`;
+const DYNAMIC_CACHE = `homelab-dynamic-${CACHE_VERSION}`;
+
+// App shell — resources to pre-cache on install
+const APP_SHELL = [
+    '/',
+    '/static/main.js',
+    '/static/containers_page.js',
+    '/static/dashboard_core.js',
+    '/static/docker_section.js',
+    '/static/favorites_manager.js',
+    '/static/icon_picker.js',
+    '/static/playbook_editor.js',
+    '/static/container_customizations_manager.js',
+    '/manifest.json',
+    '/static/icons/icon-192x192.png',
+    '/static/icons/icon-512x512.png',
+];
+
+// External CDN resources to cache on first fetch
+const CDN_PATTERNS = [
+    'cdn.tailwindcss.com',
+    'cdnjs.cloudflare.com',
+    'fonts.googleapis.com',
+    'fonts.gstatic.com',
+    'cdn.jsdelivr.net',
+];
+
+// ---- INSTALL: pre-cache app shell ----
+self.addEventListener('install', (event) => {
+    console.log('[SW] Installing...');
+    event.waitUntil(
+        caches.open(STATIC_CACHE)
+            .then((cache) => cache.addAll(APP_SHELL))
+            .then(() => self.skipWaiting())
+            .catch((err) => console.warn('[SW] Pre-cache failed for some resources:', err))
+    );
+});
+
+// ---- ACTIVATE: clean up old caches ----
+self.addEventListener('activate', (event) => {
+    console.log('[SW] Activating...');
+    event.waitUntil(
+        caches.keys()
+            .then((keys) =>
+                Promise.all(
+                    keys
+                        .filter((key) => key !== STATIC_CACHE && key !== DYNAMIC_CACHE)
+                        .map((key) => {
+                            console.log('[SW] Removing old cache:', key);
+                            return caches.delete(key);
+                        })
+                )
+            )
+            .then(() => self.clients.claim())
+    );
+});
+
+// ---- FETCH: routing strategies ----
+self.addEventListener('fetch', (event) => {
+    const { request } = event;
+    const url = new URL(request.url);
+
+    // Skip non-GET requests
+    if (request.method !== 'GET') return;
+
+    // Skip WebSocket upgrades
+    if (url.protocol === 'ws:' || url.protocol === 'wss:') return;
+
+    // Skip /docs and /redoc (Swagger UI) — always network
+    if (url.pathname.startsWith('/docs') || url.pathname.startsWith('/redoc')) return;
+
+    // --- API calls: Network First ---
+    if (url.pathname.startsWith('/api/')) {
+        event.respondWith(networkFirst(request, DYNAMIC_CACHE));
+        return;
+    }
+
+    // --- CDN resources: Cache First ---
+    if (CDN_PATTERNS.some((pattern) => url.hostname.includes(pattern))) {
+        event.respondWith(cacheFirst(request, STATIC_CACHE));
+        return;
+    }
+
+    // --- Static assets & app shell: Cache First ---
+    if (
+        url.pathname.startsWith('/static/') ||
+        url.pathname === '/manifest.json' ||
+        url.pathname === '/favicon.ico' ||
+        url.pathname === '/sw.js'
+    ) {
+        event.respondWith(cacheFirst(request, STATIC_CACHE));
+        return;
+    }
+
+    // --- HTML pages (/, etc.): Network First ---
+    event.respondWith(networkFirst(request, DYNAMIC_CACHE));
+});
+
+// ============================================================================
+// Caching strategies
+// ============================================================================
+
+/**
+ * Cache First — try cache, fall back to network (and cache the response).
+ */
+async function cacheFirst(request, cacheName) {
+    const cached = await caches.match(request);
+    if (cached) return cached;
+
+    try {
+        const response = await fetch(request);
+        if (response.ok) {
+            const cache = await caches.open(cacheName);
+            cache.put(request, response.clone());
+        }
+        return response;
+    } catch {
+        // If both cache and network fail, return a basic offline page
+        return new Response('Offline', {
+            status: 503,
+            statusText: 'Service Unavailable',
+            headers: { 'Content-Type': 'text/plain' },
+        });
+    }
+}
+
+/**
+ * Network First — try network, fall back to cache.
+ */
+async function networkFirst(request, cacheName) {
+    try {
+        const response = await fetch(request);
+        if (response.ok) {
+            const cache = await caches.open(cacheName);
+            cache.put(request, response.clone());
+        }
+        return response;
+    } catch {
+        const cached = await caches.match(request);
+        if (cached) return cached;
+
+        // For HTML navigations, serve the cached root page
+        if (request.headers.get('Accept')?.includes('text/html')) {
+            const fallback = await caches.match('/');
+            if (fallback) return fallback;
+        }
+
+        return new Response('Offline', {
+            status: 503,
+            statusText: 'Service Unavailable',
+            headers: { 'Content-Type': 'text/plain' },
+        });
+    }
+}
diff --git a/tasks_logs/.metadata_cache.json b/tasks_logs/.metadata_cache.json
index 836606f..d315dbb 100644
--- a/tasks_logs/.metadata_cache.json
+++ b/tasks_logs/.metadata_cache.json
@@ -1 +1 @@
-{"C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2025\\12\\23\\task_041616_ca3328_test-host-1.local_Vérification_de_santé_completed.md": {"start_time": "2025-12-24T04:16:16.224889+00:00", "end_time": "2025-12-24T04:16:16.225116+00:00", "duration": "0.0s", "duration_seconds": null, "hosts": [], "category": "Autre", "subcategory": null, "target_type": "host", "source_type": "manual", "task_name": "Vérification de santé", "target": "test-host-1.local", "_mtime": 1766549776.2719624}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2025\\12\\23\\task_041616_cf3208_all_Vérification_de_santé_failed.md": {"start_time": "2025-12-24T04:16:16.755925+00:00", "end_time": "2025-12-24T04:16:16.756095+00:00", "duration": "0.0s", "duration_seconds": null, "hosts": [], "category": "Autre", "subcategory": null, "target_type": "group", "source_type": "manual", "task_name": "Vérification de santé", "target": "all", "_mtime": 1766549776.7802546}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2025\\12\\23\\task_041618_378283_env_test_Vérification_de_santé_completed.md": {"start_time": "2025-12-24T04:16:18.173893+00:00", "end_time": "2025-12-24T04:16:18.174187+00:00", "duration": "0.0s", "duration_seconds": null, "hosts": ["group-host-1", "group-host-2"], "category": "Autre", "subcategory": null, "target_type": "group", "source_type": "manual", "task_name": "Vérification de santé", "target": "env_test", "_mtime": 1766549778.197829}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2025\\12\\23\\task_041618_1e6ba6_role_sbc_Vérification_de_santé_failed.md": {"start_time": "2025-12-24T04:16:18.479521+00:00", "end_time": "2025-12-24T04:16:18.479676+00:00", "duration": "0.0s", "duration_seconds": null, "hosts": ["sbc-01", "sbc-02"], "category": "Autre", "subcategory": null, "target_type": "group", "source_type": "manual", "task_name": "Vérification de santé", "target": "role_sbc", "_mtime": 1766549778.5127187}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2025\\12\\23\\task_041617_a47443_role_sbc_Playbook_Health_Check_failed.md": {"start_time": "2025-12-24T04:16:17.728818+00:00", "end_time": "2025-12-24T04:16:17.756954+00:00", "duration": "1.0s", "duration_seconds": 1, "hosts": ["orangepi"], "category": "Playbook", "subcategory": "Health Check", "target_type": "group", "source_type": "manual", "task_name": "Playbook: Health Check", "target": "role_sbc", "_mtime": 1766549777.763771}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2025\\12\\24\\task_154943_0dfef5_test-host-1.local_Vérification_de_santé_completed.md": {"start_time": "2025-12-24T15:49:43.523258+00:00", "end_time": "2025-12-24T15:49:43.523449+00:00", "duration": "0.0s", "duration_seconds": null, "hosts": [], "category": "Autre", "subcategory": null, "target_type": "host", "source_type": "manual", "task_name": "Vérification de santé", "target": "test-host-1.local", "_mtime": 1766591383.5344203}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2025\\12\\24\\task_154943_7b0547_all_Vérification_de_santé_failed.md": {"start_time": "2025-12-24T15:49:43.720927+00:00", "end_time": "2025-12-24T15:49:43.721080+00:00", "duration": "0.0s", "duration_seconds": null, "hosts": [], "category": "Autre", "subcategory": null, "target_type": "group", "source_type": "manual", "task_name": "Vérification de santé", "target": "all", "_mtime": 1766591383.743436}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2025\\12\\24\\task_154944_d73d9b_env_test_Vérification_de_santé_completed.md": {"start_time": "2025-12-24T15:49:44.310578+00:00", "end_time": "2025-12-24T15:49:44.310710+00:00", "duration": "0.0s", "duration_seconds": null, "hosts": ["group-host-1", "group-host-2"], "category": "Autre", "subcategory": null, "target_type": "group", "source_type": "manual", "task_name": "Vérification de santé", "target": "env_test", "_mtime": 1766591384.323248}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2025\\12\\24\\task_154944_a470ff_role_sbc_Vérification_de_santé_failed.md": {"start_time": "2025-12-24T15:49:44.505926+00:00", "end_time": "2025-12-24T15:49:44.506005+00:00", "duration": "0.0s", "duration_seconds": null, "hosts": ["sbc-01", "sbc-02"], "category": "Autre", "subcategory": null, "target_type": "group", "source_type": "manual", "task_name": "Vérification de santé", "target": "role_sbc", "_mtime": 1766591384.523636}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2025\\12\\24\\task_154944_bdcddf_role_sbc_Playbook_Health_Check_failed.md": {"start_time": "2025-12-24T15:49:44.119736+00:00", "end_time": "2025-12-24T15:49:44.125865+00:00", "duration": "1.0s", "duration_seconds": 1, "hosts": ["orangepi"], "category": "Playbook", "subcategory": "Health Check", "target_type": "group", "source_type": "manual", "task_name": "Playbook: Health Check", "target": "role_sbc", "_mtime": 1766591384.1273415}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2026\\03\\03\\task_000253_236dce_all_Vérification_de_santé_failed.md": {"start_time": "2026-03-04T00:02:53.593732+00:00", "end_time": "2026-03-04T00:02:53.905888+00:00", "duration": "0.3s", "duration_seconds": 0, "hosts": [], "category": "Autre", "subcategory": null, "target_type": "group", "source_type": "manual", "task_name": "Vérification de santé", "target": "all", "_mtime": 1772582573.9389596}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2026\\03\\03\\task_000254_f0d603_test-host-1.local_Vérification_de_santé_completed.md": {"start_time": "2026-03-04T00:02:54.222829+00:00", "end_time": "2026-03-04T00:02:54.222943+00:00", "duration": "0.0s", "duration_seconds": null, "hosts": [], "category": "Autre", "subcategory": null, "target_type": "host", "source_type": "manual", "task_name": "Vérification de santé", "target": "test-host-1.local", "_mtime": 1772582574.2300081}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2026\\03\\03\\task_000254_094dba_test-host_Vérification_de_santé_failed.md": {"start_time": "2026-03-04T00:02:54.138737+00:00", "end_time": "2026-03-04T00:02:54.263018+00:00", "duration": "0.1s", "duration_seconds": 0, "hosts": [], "category": "Autre", "subcategory": null, "target_type": "group", "source_type": "manual", "task_name": "Vérification de santé", "target": "test-host", "_mtime": 1772582574.2660306}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2026\\03\\03\\task_000254_0757ef_all_Vérification_de_santé_failed.md": {"start_time": "2026-03-04T00:02:54.334359+00:00", "end_time": "2026-03-04T00:02:54.334425+00:00", "duration": "0.0s", "duration_seconds": null, "hosts": [], "category": "Autre", "subcategory": null, "target_type": "group", "source_type": "manual", "task_name": "Vérification de santé", "target": "all", "_mtime": 1772582574.34154}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2026\\03\\03\\task_000254_019b47_env_test_Vérification_de_santé_completed.md": {"start_time": "2026-03-04T00:02:54.654602+00:00", "end_time": "2026-03-04T00:02:54.654670+00:00", "duration": "0.0s", "duration_seconds": null, "hosts": ["group-host-1", "group-host-2"], "category": "Autre", "subcategory": null, "target_type": "group", "source_type": "manual", "task_name": "Vérification de santé", "target": "env_test", "_mtime": 1772582574.6624749}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2026\\03\\03\\task_000254_431184_role_sbc_Vérification_de_santé_failed.md": {"start_time": "2026-03-04T00:02:54.750826+00:00", "end_time": "2026-03-04T00:02:54.750892+00:00", "duration": "0.0s", "duration_seconds": null, "hosts": ["sbc-01", "sbc-02"], "category": "Autre", "subcategory": null, "target_type": "group", "source_type": "manual", "task_name": "Vérification de santé", "target": "role_sbc", "_mtime": 1772582574.760851}, "C:\\dev\\git\\python\\homelab-automation-api-v2\\tasks_logs\\2026\\03\\03\\task_000254_b73d6d_role_sbc_Playbook_Health_Check_failed.md": {"start_time": "2026-03-04T00:02:54.544092+00:00", "end_time": "2026-03-04T00:02:54.547636+00:00", "duration": "1.0s", "duration_seconds": 1, "hosts": ["orangepi"], "category": "Playbook", "subcategory": "Health Check", "target_type": "group", "source_type": "manual", "task_name": "Playbook: Health Check", "target": "role_sbc", "_mtime": 1772582574.5481606}}
\ No newline at end of file
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\ No newline at end of file
diff --git a/tests/backend/test_pwa.py b/tests/backend/test_pwa.py
new file mode 100644
index 0000000..8260cdf
--- /dev/null
+++ b/tests/backend/test_pwa.py
@@ -0,0 +1,68 @@
+"""
+Tests pour les routes PWA (manifest.json, sw.js).
+
+Couvre:
+- Servir le manifest à la racine
+- Servir le Service Worker à la racine avec l'en-tête Service-Worker-Allowed
+- Validation du contenu JSON du manifest
+"""
+
+import json
+
+import pytest
+
+pytestmark = pytest.mark.unit
+
+
+class TestManifest:
+    """Tests pour GET /manifest.json."""
+
+    @pytest.mark.asyncio
+    async def test_manifest_served(self, client):
+        """Le manifest est servi à /manifest.json avec le bon content-type."""
+        resp = await client.get("/manifest.json")
+        assert resp.status_code == 200
+        content_type = resp.headers.get("content-type", "")
+        assert "manifest+json" in content_type or "application/json" in content_type
+
+    @pytest.mark.asyncio
+    async def test_manifest_valid_json(self, client):
+        """Le manifest contient les champs PWA requis."""
+        resp = await client.get("/manifest.json")
+        assert resp.status_code == 200
+        data = json.loads(resp.text)
+        assert "name" in data
+        assert "icons" in data
+        assert "start_url" in data
+        assert "display" in data
+        assert data["display"] == "standalone"
+        assert len(data["icons"]) >= 2
+
+
+class TestServiceWorker:
+    """Tests pour GET /sw.js."""
+
+    @pytest.mark.asyncio
+    async def test_sw_served(self, client):
+        """Le Service Worker est servi à /sw.js."""
+        resp = await client.get("/sw.js")
+        assert resp.status_code == 200
+        content_type = resp.headers.get("content-type", "")
+        assert "javascript" in content_type
+
+    @pytest.mark.asyncio
+    async def test_sw_has_scope_header(self, client):
+        """Le Service Worker a l'en-tête Service-Worker-Allowed."""
+        resp = await client.get("/sw.js")
+        assert resp.status_code == 200
+        assert resp.headers.get("service-worker-allowed") == "/"
+
+    @pytest.mark.asyncio
+    async def test_sw_contains_cache_logic(self, client):
+        """Le Service Worker contient la logique de cache."""
+        resp = await client.get("/sw.js")
+        assert resp.status_code == 200
+        body = resp.text
+        assert "caches" in body
+        assert "install" in body
+        assert "fetch" in body