fix(api): update policies type and materialisation endpoint URL

Per Backend Brooke messages:
- Made BookingDetail.policies required (commit 75c8edf deployed)
- Fixed materialisation endpoint: /materialisation-trigger → /slot-materialize
- CORS headers fix deploying on backend (X-Idempotency-Key, If-Match, If-None-Match)

Artifacts: src/types/bookings.ts:69-73, src/lib/api/materialisation.ts:91

src/lib/api/materialisation.ts

@@ -88,7 +88,7 @@ export async function triggerMaterialisation(
   }
 
   try {
-    const response = await fetch(`${API_BASE_URL}/admin/clubs/${clubId}/materialisation-trigger`, {
+    const response = await fetch(`${API_BASE_URL}/admin/clubs/${clubId}/slot-materialize`, {
       method: 'POST',
       credentials: 'include',
       headers: {

src/types/bookings.ts

@@ -66,11 +66,10 @@ export interface BookingDetail {
   updated_at: string; // ISO 8601
   provider?: ProviderInfo;
   etag?: string; // from ETag response header
-  // Optional policy fields (if backend adds them)
-  policies?: {
-    cancel_grace_minutes?: number;
-    cancel_grace_anchor?: 'start' | 'end';
-    move_window_days?: number;
+  policies: {
+    cancel_grace_minutes: number; // default: 15
+    cancel_grace_anchor: 'start' | 'end'; // current: 'start'
+    move_window_days: number; // default: 14, 0 = no limit
   };
 }