feat(dashboard): stepwise Jalali birthday picker + correct send direction

- JalaliDatePicker gains an opt-in `stepwise` mode (year → month → day): the
  year step is a scrollable list from the current Jalali year down to 1332,
  used by the birthday field. Default-off so appointment/panel pickers keep
  the month-grid behavior. Parse incoming Jalali string values safely
  (fixes NaN keys).
- Birthday create path now converts Jalali→Unix on send (changeDateType true),
  matching the update path and the Unix-based backend contract.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

components/dashboard/userAccount/detailUser/information/form/DateBirthday.js

@@ -11,6 +11,7 @@ function DateBirthday({ data, changeData, error }) {
           value={data}
           placeholder="تاریخ تولد"
           error={error}
+          stepwise
           onChange={(e) => {
             changeData(convertToJalali(e._d), "birthday");
           }}