Fix 8 critical/high resilience issues across camera, preview, logger, settings, and admin

src/screens/AdminScreen.tsx

@@ -65,6 +65,7 @@ export default function AdminScreen({ currentSettings, onSave, onClose }: AdminS
   const [countdown, setCountdown] = useState<string>(String(currentSettings.countdownDuration));
   const [printerIp, setPrinterIp] = useState<string>(currentSettings.printerIp);
   const [password, setPassword] = useState<string>(currentSettings.adminPassword);
+  const [isTogglingKiosk, setIsTogglingKiosk] = useState<boolean>(false);
   const [logs, setLogs] = useState<string | null>(null);
   const scrollViewRef = useRef<ScrollView>(null);
   
@@ -98,7 +99,9 @@ export default function AdminScreen({ currentSettings, onSave, onClose }: AdminS
     return () => clearInterval(interval);
   }, []);
 
-  const handleKioskToggle = (enable: boolean) => {
+  const handleKioskToggle = async (enable: boolean) => {
+    if (isTogglingKiosk) return;
+    setIsTogglingKiosk(true);
     try {
       if (enable) {
         const success = KioskMode.startKiosk();
@@ -124,6 +127,8 @@ export default function AdminScreen({ currentSettings, onSave, onClose }: AdminS
       }
     } catch (e: any) {
       Alert.alert('Nativer Fehler', e.message || 'Fehler im Kiosk-Modul');
+    } finally {
+      setIsTogglingKiosk(false);
     }
   };
 
@@ -298,6 +303,7 @@ export default function AdminScreen({ currentSettings, onSave, onClose }: AdminS
               placeholder="Standard: 1234"
               placeholderTextColor={THEME.colors.textMuted}
               secureTextEntry
+              maxLength={20}
               value={password}
               onChangeText={setPassword}
               keyboardType="number-pad"

src/screens/CameraScreen.tsx

@@ -129,10 +129,10 @@ export default function CameraScreen({
 
   // 1. Request built-in camera permission on mount (just in case we fallback)
   useEffect(() => {
-    if (!permission || !permission.granted) {
+    if (permission && !permission.granted && permission.canAskAgain) {
       requestPermission();
     }
-  }, [permission]);
+  }, []);
 
   // 2. Check if a USB camera is connected.
   useEffect(() => {
@@ -251,7 +251,7 @@ export default function CameraScreen({
     return () => {
       if (countdownTimerRef.current) clearTimeout(countdownTimerRef.current);
     };
-  }, [countdownDuration, isIdle, pictureSize, isUsbConnected]);
+  }, [countdownDuration, isIdle, pictureSize, isUsbConnected, burstCount, burstIntervalSec]);
 
   const startCountdown = () => {
     isCancelledRef.current = false;

src/screens/PreviewScreen.tsx

@@ -217,8 +217,9 @@ export default function PreviewScreen({
     }
   };
 
-  // Triggers the view capture and the print job
+  // ── Actions ──
   const handlePrint = async () => {
+    if (idleTimerRef.current) clearTimeout(idleTimerRef.current);
     if (!mountedRef.current) return;
     if (isProcessing) return;
     setIsProcessing(true);
@@ -253,6 +254,7 @@ export default function PreviewScreen({
 
   // Saves to gallery without printing
   const handleSaveOnly = async () => {
+    if (idleTimerRef.current) clearTimeout(idleTimerRef.current);
     if (!mountedRef.current) return;
     if (isProcessing) return;
     setIsProcessing(true);
@@ -281,6 +283,7 @@ export default function PreviewScreen({
 
   // Auto-save and exit
   const handleExit = useCallback(async () => {
+    if (idleTimerRef.current) clearTimeout(idleTimerRef.current);
     if (!mountedRef.current) return;
     if (isProcessing) return;
     const state = stateRef.current;
@@ -326,6 +329,7 @@ export default function PreviewScreen({
   }, [resetIdleTimer]);
 
   const handleRetakeClick = async () => {
+    if (idleTimerRef.current) clearTimeout(idleTimerRef.current);
     if (!mountedRef.current) return;
     if (isProcessing) return;
     if (stickers.length > 0 || layout !== 'single' || activeFrame || dateOverlay !== 'off') {