fix(pwa): Updates zuverlässiger erkennen und veraltete Instanzen automatisch reparieren

Unabhängige version.json-Prüfung, häufigere Update-Checks und Hard Recovery
beheben hängende Android-PWAs ohne manuelles Cache-Löschen.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/sw.ts

@@ -1,6 +1,8 @@
 /// <reference lib="webworker" />
 import { clientsClaim } from 'workbox-core'
 import { cleanupOutdatedCaches, precacheAndRoute } from 'workbox-precaching'
+import { registerRoute } from 'workbox-routing'
+import { NetworkOnly } from 'workbox-strategies'
 
 declare let self: ServiceWorkerGlobalScope
 
@@ -8,6 +10,9 @@ precacheAndRoute(self.__WB_MANIFEST)
 cleanupOutdatedCaches()
 clientsClaim()
 
+// Always fetch the live deploy version, even under an older precache.
+registerRoute(({ url }) => url.pathname === '/version.json', new NetworkOnly())
+
 self.addEventListener('message', (event) => {
   if (event.data?.type === 'SKIP_WAITING') {
     void self.skipWaiting()