added folder select dialog, fixed chat loading

android/src/screens/ChatScreen.tsx

@@ -101,22 +101,28 @@ const ChatScreen: React.FC = () => {
   };
 
   // Chat-Verlauf aus AsyncStorage laden
+  const isInitialLoad = useRef(true);
   useEffect(() => {
     const loadMessages = async () => {
       try {
         const stored = await AsyncStorage.getItem(CHAT_STORAGE_KEY);
+        console.log('[Chat] AsyncStorage geladen:', stored ? `${stored.length} Bytes` : 'leer');
         if (stored) {
           const parsed: ChatMessage[] = JSON.parse(stored);
-          setMessages(parsed);
-          // ID-Counter auf hoechsten Wert setzen um Kollisionen zu vermeiden
-          const maxId = parsed.reduce((max, msg) => {
-            const num = parseInt(msg.id.split('_').pop() || '0', 10);
-            return num > max ? num : max;
-          }, 0);
-          messageIdCounter.current = maxId;
+          if (Array.isArray(parsed) && parsed.length > 0) {
+            console.log('[Chat] ${parsed.length} Nachrichten geladen');
+            setMessages(parsed);
+            const maxId = parsed.reduce((max, msg) => {
+              const num = parseInt(msg.id.split('_').pop() || '0', 10);
+              return num > max ? num : max;
+            }, 0);
+            messageIdCounter.current = maxId;
+          }
         }
       } catch (err) {
         console.error('[Chat] Fehler beim Laden des Verlaufs:', err);
+      } finally {
+        isInitialLoad.current = false;
       }
     };
     loadMessages();
@@ -278,7 +284,7 @@ const ChatScreen: React.FC = () => {
 
   // Chat-Verlauf in AsyncStorage speichern (letzte N Nachrichten)
   useEffect(() => {
-    if (messages.length === 0) return;
+    if (messages.length === 0 || isInitialLoad.current) return;
     // Nur file:// URIs speichern, data: URIs rausfiltern (zu gross)
     const toStore = messages.slice(-MAX_STORED_MESSAGES).map(msg => ({
       ...msg,