Fix TypeScript errors for Docker build

- Fix optional chaining for booking properties
- Fix useMutation isLoading to isPending
- Fix email parameter types
- Fix expiredDetails array typing

src/server/rpc/cancellation.ts

@@ -343,7 +343,17 @@ export const router = {
       }
 
       // Get booking details for each expired proposal
-      const expiredDetails = [];
+      const expiredDetails: Array<{
+        customerName: string;
+        originalDate: string;
+        originalTime: string;
+        proposedDate: string;
+        proposedTime: string;
+        treatmentName: string;
+        customerEmail?: string;
+        customerPhone?: string;
+        expiredAt: string;
+      }> = [];
       for (const proposal of expiredProposals) {
         const booking = await bookingsKV.getItem(proposal.bookingId);
         if (booking) {
@@ -353,8 +363,8 @@ export const router = {
             customerName: booking.customerName,
             originalDate: proposal.originalDate || booking.appointmentDate,
             originalTime: proposal.originalTime || booking.appointmentTime,
-            proposedDate: proposal.proposedDate,
-            proposedTime: proposal.proposedTime,
+            proposedDate: proposal.proposedDate!,
+            proposedTime: proposal.proposedTime!,
             treatmentName: treatment?.name || "Unbekannte Behandlung",
             customerEmail: booking.customerEmail,
             customerPhone: booking.customerPhone,