fix(types): resolve TypeScript compilation errors in frontend build

frontend/src/features/triage/TasksView.tsx

@@ -948,11 +948,14 @@ export const TasksView: React.FC<TasksViewProps> = ({
         {/* Right Header Section: Sharing Badge, Icon-Only Button & View Switcher */}
         <div className="flex items-center gap-2">
           {currentSelectedList && (() => {
-            const isOwner = !currentSelectedList.ownerId || currentSelectedList.ownerId === currentUser?.id;
+            const listOwnerId = currentSelectedList.ownerId || currentSelectedList.userId;
+            const isOwner = currentSelectedList.isOwner !== false && (!listOwnerId || listOwnerId === currentUser?.id);
             const sharesCount = (currentSelectedList.shares?.length || 0) > 0
               ? currentSelectedList.shares.length
-              : (currentSelectedList.members?.filter((m) => m.userId !== currentSelectedList.ownerId).length || 0);
+              : (currentSelectedList.members?.filter((m) => m.userId !== listOwnerId).length || 0);
             const isShared = sharesCount > 0 || Boolean(currentSelectedList.teamId) || ((currentSelectedList.members?.length || 0) > 1);
+            const ownerMember = currentSelectedList.members?.find((m) => m.role === 'owner' || m.userId === listOwnerId);
+            const ownerDisplayName = currentSelectedList.ownerName || ownerMember?.displayName || ownerMember?.email || 'Eigentümer';
 
             return (
               <div className="flex items-center gap-1.5">
@@ -975,7 +978,7 @@ export const TasksView: React.FC<TasksViewProps> = ({
                       title="Teilen & Berechtigungen öffnen"
                     >
                       <Users className="w-2.5 h-2.5" />
-                      <span>Geteilt von {currentSelectedList.ownerName || 'Eigentümer'}</span>
+                      <span>Geteilt von {ownerDisplayName}</span>
                     </button>
                   )
                 )}