feat: implement tour listing with sorting and pagination

app/helpers/helper.php

@@ -1,5 +1,8 @@
 <?php
 
+use App\Models\Tour;
+use Carbon\Carbon;
+
 if (!function_exists('generateSortRouteParameter')) {
     function generateSortRouteParameter(string $sortKey): array
     {
@@ -21,3 +24,36 @@ if (!function_exists('activeSort')) {
         return 'text-gray-600 dark:text-gray-300 hover:text-blue-500';
     }
 }
+if (!function_exists('tourDuration')) {
+    function tourDuration(Tour $tour): string
+    {
+        $departure = $tour->tourDepartures->first();
+
+        if (!$departure) {
+            return 'نامشخص';
+        }
+
+        $start = Carbon::parse($departure->start_date);
+        $end = Carbon::parse($departure->end_date);
+
+        $nights = $start->diffInDays($end);
+        $days = $nights + 1;
+
+        return "{$days} روز و {$nights} شب";
+    }
+}
+if (!function_exists('tourDateRange')) {
+    function tourDateRange(Tour $tour): string
+    {
+        $departure = $tour->tourDepartures->first();
+
+        if (!$departure) {
+            return 'تاریخ نامشخص';
+        }
+
+        $start = Verta::instance($departure->start_date);
+        $end = Verta::instance($departure->end_date);
+
+        return $start->format('Y/m/d') . ' - ' . $end->format('Y/m/d');
+    }
+}