Restore full PWA: service worker, workbox, icons, favicons

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

config/packages/pwa.yaml

@@ -13,6 +13,33 @@ pwa:
         theme_color: '#fabf04'
         lang: fr
         dir: ltr
+        icons:
+            - src: '%kernel.project_dir%/public/favicon.png'
+              purpose: any
+            - src: '%kernel.project_dir%/public/favicon.png'
+              purpose: maskable
+    serviceworker:
+        enabled: true
+        src: '%kernel.project_dir%/public/sw.js'
+        dest: /sw.js
+        scope: /
+        use_cache: false
+        skip_waiting: true
+        workbox:
+            navigation_preload: true
+            cache_manifest: true
+            image_cache:
+                enabled: true
+                max_age: 2592000
+                max_entries: 200
+                regex: '/\.(png|jpe?g|svg|webp)$/'
+            font_cache:
+                enabled: true
+                max_entries: 10
+                max_age: 2592000
+            asset_cache:
+                enabled: true
+                regex: '/\.(css|jsx?)$/'
     favicons:
         enabled: true
         default: