Fix: Live updates in availability management

- Add manual refetch calls after slot creation/deletion
- Ensure availability list updates immediately after changes
- Fix issue where slots didn't appear in list after adding
- Improve user experience with real-time updates

src/client/components/admin-availability.tsx

@@ -10,7 +10,7 @@ export function AdminAvailability() {
   const [selectedTreatmentId, setSelectedTreatmentId] = useState<string>("");
   const [slotType, setSlotType] = useState<"treatment" | "manual">("treatment");
 
-  const { data: allSlots } = useQuery(
+  const { data: allSlots, refetch: refetchSlots } = useQuery(
     queryClient.availability.live.list.experimental_liveOptions()
   );
 
@@ -90,6 +90,9 @@ export function AdminAvailability() {
             : `Manueller Slot (${duration} Min)`;
           setSuccessMsg(`${slotDescription} angelegt.`);
           
+          // Manually refetch slots to ensure live updates
+          refetchSlots();
+          
           // advance time by the duration of the slot
           const [hStr, mStr] = time.split(":");
           let h = parseInt(hStr, 10);
@@ -337,6 +340,8 @@ export function AdminAvailability() {
                             {
                               onSuccess: () => {
                                 setSuccessMsg("Slot erfolgreich gelöscht.");
+                                // Manually refetch slots to ensure live updates
+                                refetchSlots();
                               },
                               onError: (err: any) => {
                                 const msg = (err && (err.message || (err as any).toString())) || "Fehler beim Löschen des Slots.";