Harmonize navigation and modals across cookbook & shopping list, fix WebSocket proxying, and add PWA offline support

app/static/manifest.json

@@ -1,21 +1,36 @@
 {
-  "name": "What To Cook? – Essens-Zufallsgenerator",
-  "short_name": "WhatToCook",
-  "description": "Zufallsgenerator für Essen mit Kategorien und Aufwandsfilter",
+  "name": "What To Cook? – Kochbuch & Einkaufsliste",
+  "short_name": "What To Cook?",
+  "description": "Familien-Kochbuch, Essensplaner und smarte Einkaufsliste",
   "start_url": "/",
   "display": "standalone",
-  "background_color": "#0f141c",
-  "theme_color": "#ff6b35",
+  "orientation": "portrait-primary",
+  "background_color": "#FAF6F0",
+  "theme_color": "#1E4D3B",
   "icons": [
     {
       "src": "/static/icon-192.png",
       "sizes": "192x192",
-      "type": "image/png"
+      "type": "image/png",
+      "purpose": "any maskable"
     },
     {
       "src": "/static/icon-512.png",
       "sizes": "512x512",
-      "type": "image/png"
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ],
+  "shortcuts": [
+    {
+      "name": "Einkaufsliste",
+      "url": "/shopping-list",
+      "description": "Direkt zur Einkaufsliste"
+    },
+    {
+      "name": "Kochbuch",
+      "url": "/cookbook",
+      "description": "Direkt zum Kochbuch"
     }
   ]
 }