feat: Präsentationsmodus (Schloss-Button) + Version 1.3.5

src/app/app/page.tsx

@@ -50,7 +50,8 @@ export default function AppPage() {
   const [isFullscreen, setIsFullscreen] = useState(false)
   const [auditLog, setAuditLog] = useState<{ time: string; action: string }[]>([])
   const [isAuditOpen, setIsAuditOpen] = useState(false)
-  
+  const [presentationLocked, setPresentationLocked] = useState(false)
+
   const [isSidebarCollapsed, setIsSidebarCollapsed] = useState(false)
   const [lastMapScreenshot, setLastMapScreenshot] = useState<string>('')
   const [defaultSymbolScale, setDefaultSymbolScale] = useState(1.5)
@@ -375,7 +376,7 @@ export default function AppPage() {
 
   const roleCanEdit = user ? (user.role === 'SERVER_ADMIN' || user.role === 'TENANT_ADMIN' || user.role === 'OPERATOR') : false
   // User can only edit if they have the role AND they hold the editing lock (or no one is editing)
-  const canEdit = roleCanEdit && (isEditingByMe || !editingBy)
+  const canEdit = !presentationLocked && roleCanEdit && (isEditingByMe || !editingBy)
   const isReadOnly = !!editingBy && !isEditingByMe
 
   // Auto-save: localStorage persistence + debounced API save + beacon on unload
@@ -806,6 +807,14 @@ export default function AppPage() {
           userRole={user?.role}
           onLogout={logout}
           onStartTour={() => { resetOnboardingTour(); setShowTour(true) }}
+          presentationLocked={presentationLocked}
+          onTogglePresentationLock={() => {
+            const next = !presentationLocked
+            setPresentationLocked(next)
+            if (next && isEditingByMe) {
+              handleStopEditing()
+            }
+          }}
         />
 
         {/* Offline banner */}