debug(chat): Logs fuer Anhang-Send-Pipeline

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

android/src/screens/ChatScreen.tsx

@@ -890,6 +890,7 @@ const ChatScreen: React.FC = () => {
   // Alle Pending Anhaenge + Text senden
   const sendPendingAttachments = useCallback(async (messageText: string) => {
     if (pendingAttachments.length === 0) return;
+    console.log('[Chat] sendPendingAttachments: %d Anhang/Anhaenge', pendingAttachments.length);
     const location = await getCurrentLocation();
     const msgId = nextId();
 
@@ -939,6 +940,8 @@ const ChatScreen: React.FC = () => {
       }
 
       // An RVS senden
+      console.log('[Chat] sende file: name=%s mime=%s size=%s b64Bytes=%s',
+                  name, mimeType, file.size, base64.length);
       rvs.send('file', {
         name,
         type: mimeType,