Show a Persian added-X-ago timestamp on listing cards

Add JalaliDate.TimeAgo(utc) returning «همین حالا»/«۲ ساعت پیش»/«۳ روز پیش»/«۲ هفته پیش»/«۴ ماه
پیش»/«۱ سال پیش», and display it (🕒) on the talent, job, and shift cards from their CreatedAt so
users can see how recent each listing is.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/JobsMedical.Web/Pages/Shared/_JobCard.cshtml

@@ -42,6 +42,7 @@
     {
         <div class="search-snippet">@snip</div>
     }
+    <div class="row muted" style="font-size:12px; margin-top:6px;">🕒 @JalaliDate.TimeAgo(Model.CreatedAt)</div>
     <div class="foot">
         <span class="pay">@salary</span>
         <span class="btn btn-outline" style="padding: 6px 14px;">جزئیات</span>

src/JobsMedical.Web/Pages/Shared/_ShiftCard.cshtml

@@ -41,6 +41,7 @@
         <div class="search-snippet">@snip</div>
     }
     <partial name="_HourBar" model="Model" />
+    <div class="row muted" style="font-size:12px; margin-top:6px;">🕒 @JalaliDate.TimeAgo(Model.CreatedAt)</div>
     <div class="foot">
         <span class="pay">@JalaliDate.PayLabel(Model.PayType, Model.PayAmount, Model.SharePercent)</span>
         <span class="btn btn-outline" style="padding: 6px 14px;">جزئیات</span>

src/JobsMedical.Web/Pages/Shared/_TalentCard.cshtml

@@ -54,6 +54,7 @@
             }
         </div>
     }
+    <div class="row muted" style="font-size:12px; margin-top:6px;">🕒 @JalaliDate.TimeAgo(Model.CreatedAt)</div>
     <div class="foot">
         <span class="pay">@comp</span>
         <span class="btn btn-outline" style="padding: 6px 14px;">مشاهده و تماس</span>

src/JobsMedical.Web/Services/JalaliDate.cs

@@ -30,6 +30,24 @@ public static class JalaliDate
     /// needs no timezone database.</summary>
     public static DateTime ToTehran(DateTime utc) => utc.AddMinutes(210);
 
+    /// <summary>Relative "added X ago" in Persian from a UTC timestamp: «همین حالا»، «۵ دقیقه پیش»،
+    /// «۲ ساعت پیش»، «۳ روز پیش»، «۲ هفته پیش»، «۴ ماه پیش»، «۱ سال پیش».</summary>
+    public static string TimeAgo(DateTime utc)
+    {
+        var span = DateTime.UtcNow - utc;
+        if (span < TimeSpan.Zero) span = TimeSpan.Zero;
+        var mins = (int)span.TotalMinutes;
+        if (mins < 1) return "همین حالا";
+        if (mins < 60) return ToPersianDigits(mins.ToString()) + " دقیقه پیش";
+        var hours = (int)span.TotalHours;
+        if (hours < 24) return ToPersianDigits(hours.ToString()) + " ساعت پیش";
+        var days = (int)span.TotalDays;
+        if (days < 7) return ToPersianDigits(days.ToString()) + " روز پیش";
+        if (days < 30) return ToPersianDigits((days / 7).ToString()) + " هفته پیش";
+        if (days < 365) return ToPersianDigits((days / 30).ToString()) + " ماه پیش";
+        return ToPersianDigits((days / 365).ToString()) + " سال پیش";
+    }
+
     /// <summary>Jalali date + Tehran time, e.g. «۳۰ خرداد ۱۴۰۵ ۱۶:۲۱» — for UTC-stored timestamps.</summary>
     public static string DateTimeLabel(DateTime utc)
     {