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>

src/Treatment/Controller/TreatmentCaseController.php

@@ -52,10 +52,34 @@ class TreatmentCaseController extends BaseController
 
         return $this->success(array_map(
             static fn (TreatmentCase $c): array => $c->toArray(),
-            $this->cases->findForTenant($entityType, $entityId, $status, $q !== '' ? $q : null),
+            $this->cases->findForTenant(
+                $entityType,
+                $entityId,
+                $status,
+                $q !== '' ? $q : null,
+                $this->dayBoundary($request->query->get('from'), '00:00:00'),
+                $this->dayBoundary($request->query->get('to'), '23:59:59'),
+            ),
         ));
     }
 
+    /**
+     * `YYYY-MM-DD` میلادی → ثانیهٔ ابتدای/انتهای همان روز.
+     *
+     * تایم‌زون سراسری اپلیکیشن تهران است (`config/bootstrap_tz.php`)، پس همان
+     * `strtotime` که بقیهٔ فیلترهای تاریخِ نوبت‌ها استفاده می‌کنند اینجا هم درست است.
+     */
+    private function dayBoundary(mixed $value, string $time): ?int
+    {
+        if (!is_string($value) || !preg_match('/^\d{4}-\d{2}-\d{2}$/', $value)) {
+            return null;
+        }
+
+        $ts = strtotime($value . ' ' . $time);
+
+        return $ts === false ? null : $ts;
+    }
+
     #[Route('/api/v1/treatment-case/{uuid}', name: 'treatment_case_show', methods: ['GET'])]
     public function show(#[CurrentUser] User $user, string $uuid): JsonResponse
     {