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

app/main.py

@@ -10,7 +10,7 @@ from typing import List, Optional, Dict, Any
 from contextlib import asynccontextmanager
 
 from fastapi import FastAPI, HTTPException, Request, Query, Form, File, UploadFile, WebSocket, WebSocketDisconnect
-from fastapi.responses import HTMLResponse, JSONResponse, RedirectResponse
+from fastapi.responses import HTMLResponse, JSONResponse, RedirectResponse, FileResponse
 from fastapi.staticfiles import StaticFiles
 from fastapi.templating import Jinja2Templates
 from datetime import datetime, date, timedelta
@@ -70,7 +70,7 @@ APP_USERNAME = os.getenv("APP_USERNAME", "admin")
 APP_PASSWORD = os.getenv("APP_PASSWORD", "wtc2026!")
 SECRET_KEY = os.getenv("SECRET_KEY", "wtc_cookbook_secret_salt_2026_supersecure")
 COOKIE_NAME = "wtc_auth"
-PUBLIC_PATHS = {"/login", "/api/login", "/favicon.ico"}
+PUBLIC_PATHS = {"/login", "/api/login", "/favicon.ico", "/manifest.json", "/sw.js"}
 
 def create_auth_token(username: str, days: int = 30) -> str:
     expiry = int(time.time()) + (days * 86400)
@@ -224,6 +224,25 @@ class ShoppingItemCategoryUpdate(BaseModel):
     category: str
 
 
+# ==========================================
+# PWA MANIFEST & SERVICE WORKER
+# ==========================================
+
+@app.get("/manifest.json")
+def get_manifest():
+    manifest_path = os.path.join(STATIC_DIR, "manifest.json")
+    if os.path.exists(manifest_path):
+        return FileResponse(manifest_path, media_type="application/manifest+json")
+    raise HTTPException(status_code=404, detail="Manifest not found")
+
+@app.get("/sw.js")
+def get_service_worker():
+    sw_path = os.path.join(STATIC_DIR, "sw.js")
+    if os.path.exists(sw_path):
+        return FileResponse(sw_path, media_type="application/javascript", headers={"Service-Worker-Allowed": "/"})
+    raise HTTPException(status_code=404, detail="Service worker not found")
+
+
 # ==========================================
 # AUTH VIEWS
 # ==========================================

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"
     }
   ]
 }

app/static/sw.js

@@ -0,0 +1,100 @@
+// What To Cook? - PWA Service Worker (v1.0.0)
+const CACHE_NAME = 'wtc-cache-v1';
+const PRECACHE_URLS = [
+  '/',
+  '/cookbook',
+  '/shopping-list',
+  '/manifest.json',
+  '/static/cookbook.css',
+  '/static/icon-192.png',
+  '/static/icon-512.png'
+];
+
+// Install: Pre-cache shell assets
+self.addEventListener('install', (event) => {
+  event.waitUntil(
+    caches.open(CACHE_NAME).then((cache) => {
+      return cache.addAll(PRECACHE_URLS).catch((err) => {
+        console.warn('[SW] Pre-caching partial failure, continuing:', err);
+      });
+    }).then(() => self.skipWaiting())
+  );
+});
+
+// Activate: Clean up old caches
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys().then((cacheNames) => {
+      return Promise.all(
+        cacheNames.map((cacheName) => {
+          if (cacheName !== CACHE_NAME) {
+            return caches.delete(cacheName);
+          }
+        })
+      );
+    }).then(() => self.clients.claim())
+  );
+});
+
+// Fetch: Strategy
+self.addEventListener('fetch', (event) => {
+  const req = event.request;
+  const url = new URL(req.url);
+
+  // Skip non-GET and WebSocket/API mutation requests
+  if (req.method !== 'GET') return;
+  if (url.pathname.startsWith('/ws/') || url.pathname.startsWith('/api/')) return;
+
+  // Navigation requests (HTML pages): Network first, fallback to cache
+  if (req.mode === 'navigate') {
+    event.respondWith(
+      fetch(req).then((response) => {
+        if (response && response.status === 200) {
+          const copy = response.clone();
+          caches.open(CACHE_NAME).then((cache) => cache.put(req, copy));
+        }
+        return response;
+      }).catch(async () => {
+        const cached = await caches.match(req);
+        if (cached) return cached;
+        // If exact page not cached, return home or shopping list if available
+        if (url.pathname === '/shopping-list') {
+          const shopCached = await caches.match('/shopping-list');
+          if (shopCached) return shopCached;
+        }
+        const homeCached = await caches.match('/');
+        if (homeCached) return homeCached;
+        return new Response('Offline – keine Verbindung vorhanden.', {
+          status: 503,
+          headers: { 'Content-Type': 'text/plain; charset=utf-8' }
+        });
+      })
+    );
+    return;
+  }
+
+  // Static assets: Cache-first, then network update
+  if (url.pathname.startsWith('/static/') || url.hostname.includes('fonts.googleapis.com') || url.hostname.includes('fonts.gstatic.com')) {
+    event.respondWith(
+      caches.match(req).then((cached) => {
+        if (cached) {
+          // In background, refresh cache
+          fetch(req).then((networkRes) => {
+            if (networkRes && networkRes.status === 200) {
+              caches.open(CACHE_NAME).then((cache) => cache.put(req, networkRes));
+            }
+          }).catch(() => {});
+          return cached;
+        }
+        return fetch(req).then((networkRes) => {
+          if (networkRes && networkRes.status === 200) {
+            const copy = networkRes.clone();
+            caches.open(CACHE_NAME).then((cache) => cache.put(req, copy));
+          }
+          return networkRes;
+        });
+      })
+    );
+    return;
+  }
+});

app/templates/cookbook.html

@@ -4,7 +4,13 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Mein Kochbuch – What To Cook?</title>
-  <link rel="stylesheet" href="/static/cookbook.css?v=4.5.4">
+  <link rel="manifest" href="/manifest.json">
+  <meta name="theme-color" content="#1E4D3B">
+  <meta name="apple-mobile-web-app-capable" content="yes">
+  <meta name="apple-mobile-web-app-status-bar-style" content="default">
+  <meta name="apple-mobile-web-app-title" content="What To Cook?">
+  <link rel="apple-touch-icon" href="/static/icon-192.png">
+  <link rel="stylesheet" href="/static/cookbook.css?v=4.6.1">
   <link rel="icon" href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>📖</text></svg>">
   <style id="print-engine-styles">
     /* Auf dem Bildschirm: Cover, Inhaltsverzeichnis und Seitenzahlen ausblenden */
@@ -2717,6 +2723,12 @@
         openRecipeModal();
       }
     });
+
+    if ('serviceWorker' in navigator) {
+      window.addEventListener('load', () => {
+        navigator.serviceWorker.register('/sw.js').catch(err => console.log('SW register fail:', err));
+      });
+    }
   </script>
 </body>
 </html>

app/templates/home.html

@@ -4,6 +4,12 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover">
   <title>What To Cook? – Menü</title>
+  <link rel="manifest" href="/manifest.json">
+  <meta name="theme-color" content="#1E4D3B">
+  <meta name="apple-mobile-web-app-capable" content="yes">
+  <meta name="apple-mobile-web-app-status-bar-style" content="default">
+  <meta name="apple-mobile-web-app-title" content="What To Cook?">
+  <link rel="apple-touch-icon" href="/static/icon-192.png">
   <link rel="stylesheet" href="/static/cookbook.css?v=4.6.1">
   <link rel="icon" href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>🍽️</text></svg>">
   <style>
@@ -289,5 +295,12 @@
 
   </main>
 
+  <script>
+    if ('serviceWorker' in navigator) {
+      window.addEventListener('load', () => {
+        navigator.serviceWorker.register('/sw.js').catch(err => console.log('SW register fail:', err));
+      });
+    }
+  </script>
 </body>
 </html>