fix: expand recurring events in CalendarEvent/query (closes #65)

Add expandRecurrences: true to CalendarEvent/query when a date range
filter is provided, so the JMAP server returns individual occurrences
of recurring events instead of only the master event.

lib/jmap/client.ts

@@ -2919,6 +2919,10 @@ export class JMAPClient {
         filter,
         limit: limit || 1000,
       };
+      // Expand recurring events into individual occurrences when a date range is provided
+      if (filter.after || filter.before) {
+        queryArgs.expandRecurrences = true;
+      }
       if (sort) {
         queryArgs.sort = sort;
       }