feat: add 'Produkttour starten' to user menu

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/layout/UserMenu.tsx

@@ -1,7 +1,7 @@
 import { useState } from 'react'
 import { useNavigate } from 'react-router'
 import { Avatar, Box, Divider, IconButton, ListItemIcon, Menu, MenuItem, Typography } from '@mui/material'
-import { LogOut, Settings, User } from 'lucide-react'
+import { HelpCircle, LogOut, Settings, User } from 'lucide-react'
 import { useSessionStore } from '../../stores/sessionStore'
 import { useToastStore } from '../../stores/toastStore'
 import { DemoRoleSwitcher } from '../auth/DemoRoleSwitcher'
@@ -85,6 +85,10 @@ export function UserMenu() {
           <ListItemIcon><Settings size={16} /></ListItemIcon>
           Einstellungen
         </MenuItem>
+        <MenuItem onClick={() => { handleClose(); localStorage.removeItem('property_match_welcomed'); window.location.reload() }}>
+          <ListItemIcon><HelpCircle size={16} /></ListItemIcon>
+          Produkttour starten
+        </MenuItem>
 
         <Divider />