fix(report): end the visit offer on the record's day from the server

The preparation window now carries to, the booked visit's own day on
the record's calendar, and the report offer uses it. Cutting the end in
the reader's zone was wrong for a guardian viewing a managed profile in
another zone.

docs/api/openapi.yaml

@@ -72152,6 +72152,10 @@ components:
           type: string
           description: "First day of the window, `YYYY-MM-DD` on the record's own calendar: the day of `since`, or 90 days before
             today on `default`."
+        to:
+          type: string
+          description: The booked visit's own day, `YYYY-MM-DD` on the same calendar as `from` (the record's, not the reader's). A
+            report window offered for the appointment ends here.
         basis:
           type: string
           enum:
@@ -72169,6 +72173,7 @@ components:
             - type: "null"
       required:
         - from
+        - to
         - basis
         - since
       additionalProperties: false