feat: add Offline Mode Indicator (Bunker Status)

public/sw.js

@@ -43,10 +43,19 @@ self.addEventListener('install', (event) => {
             });
             await Promise.all(promises);
             console.log('✅ PWA: Bunker build finished');
+
+            // Signal to clients that pre-caching is complete
+            broadcast({ type: 'PRECACHE_COMPLETE', version: CACHE_NAME });
         })
     );
 });
 
+// Helper: Broadcast to all clients
+async function broadcast(message) {
+    const clients = await self.clients.matchAll();
+    clients.forEach(client => client.postMessage(message));
+}
+
 // Activate: Alte Bunker räumen
 self.addEventListener('activate', (event) => {
     event.waitUntil(
@@ -64,6 +73,17 @@ self.addEventListener('activate', (event) => {
     self.clients.claim();
 });
 
+// Communication: Listen for status checks
+self.addEventListener('message', (event) => {
+    if (event.data?.type === 'CHECK_BUNKER_STATUS') {
+        event.source.postMessage({
+            type: 'BUNKER_STATUS',
+            isReady: true,
+            version: CACHE_NAME
+        });
+    }
+});
+
 self.addEventListener('fetch', (event) => {
     // Nur GET-Requests cachen
     if (event.request.method !== 'GET') return;

src/components/OfflineIndicator.tsx

@@ -1,32 +1,84 @@
 'use client';
 
 import React, { useState, useEffect } from 'react';
-import { WifiOff } from 'lucide-react';
+import { WifiOff, ShieldCheck } from 'lucide-react';
 
 export default function OfflineIndicator() {
     const [isOffline, setIsOffline] = useState(false);
+    const [isBunkerReady, setIsBunkerReady] = useState(false);
 
     useEffect(() => {
         setIsOffline(!navigator.onLine);
+        // Check if bunker was already ready from previous session
+        const savedReady = localStorage.getItem('whisky_bunker_ready') === 'true';
+        setIsBunkerReady(savedReady);
 
         const handleOnline = () => setIsOffline(false);
         const handleOffline = () => setIsOffline(true);
 
+        const handleMessage = (event: MessageEvent) => {
+            if (event.data?.type === 'PRECACHE_COMPLETE' || event.data?.type === 'BUNKER_STATUS') {
+                console.log('🛡️ PWA: Bunker is ready for offline use!');
+                setIsBunkerReady(true);
+                localStorage.setItem('whisky_bunker_ready', 'true');
+            }
+        };
+
         window.addEventListener('online', handleOnline);
         window.addEventListener('offline', handleOffline);
 
+        if ('serviceWorker' in navigator) {
+            navigator.serviceWorker.addEventListener('message', handleMessage);
+
+            // Proactively check status if SW is already active
+            if (navigator.serviceWorker.controller) {
+                navigator.serviceWorker.controller.postMessage({ type: 'CHECK_BUNKER_STATUS' });
+            }
+        }
+
         return () => {
             window.removeEventListener('online', handleOnline);
             window.removeEventListener('offline', handleOffline);
+            if ('serviceWorker' in navigator) {
+                navigator.serviceWorker.removeEventListener('message', handleMessage);
+            }
         };
     }, []);
 
-    if (!isOffline) return null;
+    if (isOffline) {
+        return (
+            <div className="fixed top-0 left-0 w-full bg-red-600 text-white text-[10px] font-black uppercase tracking-widest py-1 flex items-center justify-center gap-2 z-[9999] animate-pulse">
+                <WifiOff size={12} />
+                Offline-Modus: Bunker aktiv 🛡️
+            </div>
+        );
+    }
 
+    if (isBunkerReady) {
+        return (
+            <div className="fixed bottom-20 right-4 z-[90] animate-in fade-in slide-in-from-right-4 duration-500">
+                <div className="bg-zinc-900/80 backdrop-blur-md border border-green-500/30 px-3 py-1.5 rounded-full flex items-center gap-2 shadow-lg shadow-green-500/10 group hover:bg-zinc-900 transition-colors cursor-help">
+                    <ShieldCheck size={14} className="text-green-500" />
+                    <span className="text-[9px] font-black uppercase tracking-widest text-zinc-300">
+                        Bunker Aktiv
+                    </span>
+                    <div className="absolute bottom-full right-0 mb-2 w-48 p-2 bg-zinc-900 text-[10px] text-zinc-400 rounded-xl border border-white/10 opacity-0 group-hover:opacity-100 transition-opacity pointer-events-none shadow-2xl">
+                        Die App ist vollständig im "Bunker" gespeichert und funktioniert auch ohne Internet.
+                    </div>
+                </div>
+            </div>
+        );
+    }
+
+    // Show nothing if online and not ready yet (or show a loading state?)
     return (
-        <div className="fixed top-0 left-0 w-full bg-red-600 text-white text-[10px] font-black uppercase tracking-widest py-1 flex items-center justify-center gap-2 z-[9999] animate-pulse">
-            <WifiOff size={12} />
-            Offline-Modus: Du siehst eine gespeicherte Version
+        <div className="fixed bottom-20 right-4 z-[90] animate-in fade-in slide-in-from-right-4">
+            <div className="bg-zinc-900/80 backdrop-blur-md border border-amber-500/30 px-3 py-1.5 rounded-full flex items-center gap-2 shadow-lg shadow-amber-500/10">
+                <div className="w-1.5 h-1.5 bg-amber-500 rounded-full animate-pulse" />
+                <span className="text-[9px] font-black uppercase tracking-widest text-zinc-300">
+                    Bunker wird geladen...
+                </span>
+            </div>
         </div>
     );
 }