feat(vacay): add manual school holiday calendars

client/src/repo/schoolHolidayCatalogRepo.ts

@@ -0,0 +1,10 @@
+import { schoolHolidayCatalogApi } from '../api/schoolHolidayCatalog'
+import { isEffectivelyOffline } from '../sync/networkMode'
+
+// Instance administration is online-only: a shared catalog must not replay stale edits.
+export const schoolHolidayCatalogRepo = {
+  ...schoolHolidayCatalogApi,
+  requireOnline() {
+    if (isEffectivelyOffline()) throw new Error('School holiday administration requires a connection')
+  },
+}