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>