PWA-Unterstützung hinzugefügt: manifest.webmanifest, Service Worker, Installierbarkeit auf Homescreen/Desktop

static/manifest.webmanifest

@@ -0,0 +1,18 @@
+{
+  "name": "Wordle‑Cheater",
+  "short_name": "W‑Cheater",
+  "description": "Hilft bei der Lösung deutschsprachiger Wordle‑Rätsel mit Positions- und Buchstabenfiltern.",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "background_color": "#0b1220",
+  "theme_color": "#0b1220",
+  "icons": [
+    {
+      "src": "/static/favicon.svg",
+      "sizes": "any",
+      "type": "image/svg+xml",
+      "purpose": "any maskable"
+    }
+  ]
+}

static/sw.js

@@ -0,0 +1,39 @@
+const CACHE_NAME = 'wordle-cheater-v1';
+const APP_SHELL = [
+  '/',
+  '/static/favicon.svg',
+];
+
+self.addEventListener('install', (event) => {
+  event.waitUntil(
+    caches.open(CACHE_NAME).then((cache) => cache.addAll(APP_SHELL))
+  );
+});
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys().then((keys) => Promise.all(
+      keys.map((k) => (k === CACHE_NAME ? null : caches.delete(k)))
+    ))
+  );
+});
+
+self.addEventListener('fetch', (event) => {
+  const { request } = event;
+  // Netzwerk zuerst für HTML, sonst Cache-First
+  if (request.mode === 'navigate') {
+    event.respondWith(
+      fetch(request).catch(() => caches.match('/'))
+    );
+    return;
+  }
+  event.respondWith(
+    caches.match(request).then((cached) =>
+      cached || fetch(request).then((resp) => {
+        const copy = resp.clone();
+        caches.open(CACHE_NAME).then((cache) => cache.put(request, copy));
+        return resp;
+      })
+    )
+  );
+});