feat: Erweiterte Filtermöglichkeiten für Buchungsverwaltung

- Neue Filter-Modi: Zukünftige (default), Alle, Datum
- Filter-Buttons mit visueller Hervorhebung des aktiven Filters
- Datumsauswahl nur sichtbar wenn Datum-Filter aktiv
- Default-Filter zeigt alle zukünftigen (nicht stornierten) Buchungen
- Angepasste Leermeldungen je nach aktivem Filter

src/client/components/admin-bookings.tsx

@@ -3,6 +3,7 @@ import { useMutation, useQuery } from "@tanstack/react-query";
 import { queryClient } from "@/client/rpc-client";
 
 export function AdminBookings() {
+  const [filterMode, setFilterMode] = useState<"upcoming" | "all" | "date">("upcoming");
   const [selectedDate, setSelectedDate] = useState(new Date().toISOString().split('T')[0]);
   const [selectedPhoto, setSelectedPhoto] = useState<string>("");
   const [showPhotoModal, setShowPhotoModal] = useState(false);
@@ -139,9 +140,23 @@ export function AdminBookings() {
     return appointmentDate >= today;
   };
 
-  const filteredBookings = bookings?.filter(booking => 
-    selectedDate ? booking.appointmentDate === selectedDate : true
-  ).sort((a, b) => {
+  // Filter bookings based on selected filter mode
+  const filteredBookings = bookings?.filter(booking => {
+    if (filterMode === "upcoming") {
+      // Show all future bookings (not cancelled)
+      const bookingDate = new Date(booking.appointmentDate);
+      const today = new Date();
+      today.setHours(0, 0, 0, 0);
+      bookingDate.setHours(0, 0, 0, 0);
+      return bookingDate >= today && booking.status !== "cancelled";
+    } else if (filterMode === "date") {
+      // Show bookings for specific date
+      return booking.appointmentDate === selectedDate;
+    } else {
+      // Show all bookings
+      return true;
+    }
+  }).sort((a, b) => {
     if (a.appointmentDate === b.appointmentDate) {
       return a.appointmentTime.localeCompare(b.appointmentTime);
     }
@@ -218,22 +233,54 @@ export function AdminBookings() {
         </div>
       </div>
 
-      {/* Date Filter */}
+      {/* Filter Section */}
       <div className="bg-white rounded-lg shadow p-4 mb-6">
-        <div className="flex items-center space-x-4">
-          <label className="text-sm font-medium text-gray-700">Filter by date:</label>
-          <input
-            type="date"
-            value={selectedDate}
-            onChange={(e) => setSelectedDate(e.target.value)}
-            className="p-2 border border-gray-300 rounded-md focus:ring-2 focus:ring-pink-500 focus:border-pink-500"
-          />
-          <button
-            onClick={() => setSelectedDate("")}
-            className="text-sm text-pink-600 hover:text-pink-800"
-          >
-            Show All
-          </button>
+        <div className="flex flex-col space-y-4">
+          <div className="flex items-center space-x-2">
+            <label className="text-sm font-medium text-gray-700">Filter:</label>
+            <button
+              onClick={() => setFilterMode("upcoming")}
+              className={`px-4 py-2 rounded-md text-sm font-medium transition-colors ${
+                filterMode === "upcoming"
+                  ? "bg-pink-600 text-white"
+                  : "bg-gray-100 text-gray-700 hover:bg-gray-200"
+              }`}
+            >
+              Zukünftige
+            </button>
+            <button
+              onClick={() => setFilterMode("all")}
+              className={`px-4 py-2 rounded-md text-sm font-medium transition-colors ${
+                filterMode === "all"
+                  ? "bg-pink-600 text-white"
+                  : "bg-gray-100 text-gray-700 hover:bg-gray-200"
+              }`}
+            >
+              Alle
+            </button>
+            <button
+              onClick={() => setFilterMode("date")}
+              className={`px-4 py-2 rounded-md text-sm font-medium transition-colors ${
+                filterMode === "date"
+                  ? "bg-pink-600 text-white"
+                  : "bg-gray-100 text-gray-700 hover:bg-gray-200"
+              }`}
+            >
+              Datum
+            </button>
+          </div>
+          
+          {filterMode === "date" && (
+            <div className="flex items-center space-x-4 pl-16">
+              <label className="text-sm font-medium text-gray-700">Wähle Datum:</label>
+              <input
+                type="date"
+                value={selectedDate}
+                onChange={(e) => setSelectedDate(e.target.value)}
+                className="p-2 border border-gray-300 rounded-md focus:ring-2 focus:ring-pink-500 focus:border-pink-500"
+              />
+            </div>
+          )}
         </div>
       </div>
 
@@ -369,8 +416,10 @@ export function AdminBookings() {
         
         {!filteredBookings?.length && (
           <div className="text-center py-8 text-gray-500">
-            {selectedDate 
+            {filterMode === "date"
               ? `Keine Buchungen für ${new Date(selectedDate).toLocaleDateString()} gefunden`
+              : filterMode === "upcoming"
+              ? "Keine zukünftigen Buchungen verfügbar."
               : "Keine Buchungen verfügbar."
             }
           </div>