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/NewSessionPage.tsx

@@ -9,7 +9,8 @@ import SessionStepper from '../components/SessionStepper';
 import CreateStep from '../components/session/CreateStep';
 import PaymentStep from '../components/session/PaymentStep';
 import DetailsStep from '../components/session/DetailsStep';
-import { ArrowLeftPH, ArrowLeftD, CloseModalD } from '../components/icons/FilesServiceIcons';
+import { CloseModalD } from '../components/icons/FilesServiceIcons';
+import { Breadcrumb } from '../components/PatientCaseBanner';
 
 /**
  * ثبت مراجعه جدید — پورت کامل tauri /files/create-service (حالت ایجاد):
@@ -52,23 +53,7 @@ export default function NewSessionPage() {
 
   return (
     <div className="fade-in" style={{ width: '100%' }}>
-      {/* breadcrumb — tauri AddService header */}
-      <div style={{ display: 'flex', justifyContent: 'flex-start', marginBottom: 30 }}>
-        <div style={{ display: 'flex', alignItems: 'center', gap: 8, color: 'var(--text-2)', fontSize: 12, padding: '0 16px' }}>
-          <div
-            onClick={() => nav(-1)}
-            className="bg-[var(--surface)]"
-            style={{ display: 'flex', alignItems: 'center', gap: 4, padding: '6px 8px', borderRadius: 12, cursor: 'pointer' }}
-          >
-            <ArrowLeftPH style={{ width: 18, height: 18, rotate: '180deg' }} />
-            <span>بازگشت</span>
-          </div>
-          <ArrowLeftD />
-          <span>پرونده</span>
-          <ArrowLeftD />
-          <span style={{ color: 'var(--text)' }}>{patientName}</span>
-        </div>
-      </div>
+      <Breadcrumb name={patientName} backTo={`/admin/patients/${recordUuid}`} />
 
       {/* card — tauri width 748 centered */}
       <div style={{ width: '100%', display: 'flex', justifyContent: 'center' }}>