feat(treatment): date-range filter on treatment cases, and time on the start stamp

The list could be narrowed by status and by search but not by when a case
opened, which is the one axis a clinic actually reports on. `from` and `to`
(YYYY-MM-DD) now bound `opened_at`, using the same strtotime day-boundary
convention the appointment date filters already use under the app's global
Tehran timezone. A malformed value is ignored rather than erroring — this is a
filter, not a form field.

Both bounds live in the URL via useUrlState, so back and refresh keep the range.
The two date inputs and the "تا" between them are one nowrap unit; letting them
wrap separately orphaned the word from its field on a 390px screen.

The card's "شروع" showed only the Jalali date, so several cases opened on the
same day were indistinguishable on that line too. It now uses formatDateTime.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/api/treatment.md

@@ -210,6 +210,11 @@ single-session again. Idempotent: deleting a service that has no protocol still
 |---|---|
 | `status` | `active` \| `completed` \| `abandoned` — نبودش یعنی همه |
 | `q` | جستجو روی نام بیمار، موبایل، کد ملی، شمارهٔ پرونده و نام سرویس |
+| `from` | `YYYY-MM-DD` میلادی — پرونده‌هایی که از ابتدای این روز به بعد باز شده‌اند |
+| `to` | `YYYY-MM-DD` میلادی — تا انتهای این روز |
+
+بازه روی `opened_at` است نه سررسید جلسه. تایم‌زون تهران (`config/bootstrap_tz.php`).
+مقدارِ بدفرم بی‌صدا نادیده گرفته می‌شود، نه خطا — فیلتر است نه ورودی فرم.
 
 ```json
 {