feat: implement BackButton component for consistent navigation

- Added BackButton component to standardize back navigation across pages.
- Integrated BackButton into various pages, replacing custom back buttons for consistency.
- Updated PageHeader to accept backTo prop for displaying BackButton when navigating from subpages.
- Created useGoBack hook to handle navigation logic, determining whether to go back in history or redirect to a fallback page.
- Added tests for BackButton and its integration with PageHeader to ensure expected behavior.

assets/admin/pages/AppointmentDetailPage.tsx

@@ -115,19 +115,13 @@ export default function AppointmentDetailPage() {
   return (
     <div>
       <PageHeader
+        backTo="/admin/appointments"
         title="جزئیات نوبت"
         breadcrumbs={[
           { label: 'داشبورد', to: '/admin/dashboard' },
           { label: 'نوبت‌ها', to: backTo },
           { label: 'جزئیات' },
         ]}
-        action={
-          <button onClick={() => navigate(backTo)}
-            className="flex items-center gap-2 text-sm text-[var(--text-2)] hover:text-[var(--text)] transition-colors">
-            <ArrowRightIcon className="w-4 h-4" />
-            بازگشت
-          </button>
-        }
       />
 
       {isLoading ? (