feat: Hide tutorial on login, add 'Angemeldet bleiben' checkbox

- OnboardingTutorial: Skip on /login, /auth, /register paths
- AuthForm: Added remember-me checkbox (default: checked)
- Session persistence based on checkbox selection

src/components/OnboardingTutorial.tsx

@@ -1,6 +1,7 @@
 'use client';
 
 import { useState, useEffect } from 'react';
+import { usePathname } from 'next/navigation';
 import { motion, AnimatePresence } from 'framer-motion';
 import { Scan, GlassWater, Users, Settings, ArrowRight, X, Sparkles } from 'lucide-react';
 
@@ -49,8 +50,14 @@ const STEPS: OnboardingStep[] = [
 export default function OnboardingTutorial() {
     const [isOpen, setIsOpen] = useState(false);
     const [currentStep, setCurrentStep] = useState(0);
+    const pathname = usePathname();
 
     useEffect(() => {
+        // Don't show on login/auth pages
+        if (pathname === '/login' || pathname === '/auth' || pathname === '/register') {
+            return;
+        }
+
         // Check if onboarding was completed
         const completed = localStorage.getItem(ONBOARDING_KEY);
         if (!completed) {
@@ -58,7 +65,7 @@ export default function OnboardingTutorial() {
             const timer = setTimeout(() => setIsOpen(true), 1000);
             return () => clearTimeout(timer);
         }
-    }, []);
+    }, [pathname]);
 
     const handleNext = () => {
         if (currentStep < STEPS.length - 1) {
@@ -125,10 +132,10 @@ export default function OnboardingTutorial() {
                             <div
                                 key={index}
                                 className={`w-2 h-2 rounded-full transition-all ${index === currentStep
-                                        ? 'w-6 bg-orange-500'
-                                        : index < currentStep
-                                            ? 'bg-orange-500/50'
-                                            : 'bg-zinc-700'
+                                    ? 'w-6 bg-orange-500'
+                                    : index < currentStep
+                                        ? 'bg-orange-500/50'
+                                        : 'bg-zinc-700'
                                     }`}
                             />
                         ))}