debug(gps): Logs fuer Standort-Abfrage und Permission-Fehler

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

android/src/screens/ChatScreen.tsx

@@ -725,17 +725,23 @@ const ChatScreen: React.FC = () => {
 
   // GPS-Position holen (optional)
   const getCurrentLocation = useCallback((): Promise<{ lat: number; lon: number } | null> => {
-    if (!gpsEnabled) return Promise.resolve(null);
+    if (!gpsEnabled) {
+      console.log('[GPS] gpsEnabled=false → kein Standort');
+      return Promise.resolve(null);
+    }
 
     return new Promise((resolve) => {
       Geolocation.getCurrentPosition(
         (position) => {
-          resolve({
+          const loc = {
             lat: position.coords.latitude,
             lon: position.coords.longitude,
-          });
+          };
+          console.log('[GPS] Position: lat=%s lon=%s', loc.lat, loc.lon);
+          resolve(loc);
         },
-        (_error) => {
+        (error) => {
+          console.warn('[GPS] getCurrentPosition Fehler:', error?.code, error?.message);
           resolve(null);
         },
         { enableHighAccuracy: false, timeout: 5000 },