Fix useless bare-divar.ir links + hide empty homepage shifts section

- Divar listings with no extractable post token were given SourceUrl «https://divar.ir» — a link
  that just opens Divar''s homepage, not the ad. Store null instead, and guard the contact-modal
  fallback to require a real path (so existing bare-domain links stop being offered too).
- Homepage «جدیدترین شیفت‌ها»: only render when there are real open shifts. Almost all aggregated
  ads are ongoing hiring (jobs), not dated shifts, so the section was showing a fabricated shift
  date (the «۱۸ خرداد» on the welcome page). Now it hides when empty.

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

src/JobsMedical.Web/Pages/Index.cshtml

@@ -53,27 +53,25 @@
     </div>
 </section>
 
-<section class="section">
-    <div class="container">
-        <div class="section-head">
-            <h2>جدیدترین شیفت‌ها</h2>
-            <a href="/Shifts">مشاهده همه ←</a>
-        </div>
-        @if (Model.LatestShifts.Count == 0)
-        {
-            <div class="empty-state">فعلاً شیفت بازی ثبت نشده است.</div>
-        }
-        else
-        {
+@* Shifts are rare for aggregated content (most ads are ongoing hiring, not dated shifts) — only
+   show the section when there are real open shifts, so we never display a fabricated/empty date. *@
+@if (Model.LatestShifts.Count > 0)
+{
+    <section class="section">
+        <div class="container">
+            <div class="section-head">
+                <h2>جدیدترین شیفت‌ها</h2>
+                <a href="/Shifts">مشاهده همه ←</a>
+            </div>
             <div class="grid grid-3">
                 @foreach (var s in Model.LatestShifts)
                 {
                     <partial name="_ShiftCard" model="s" />
                 }
             </div>
-        }
-    </div>
-</section>
+        </div>
+    </section>
+}
 
 @if (Model.LatestJobs.Count > 0)
 {

src/JobsMedical.Web/Program.cs

@@ -426,7 +426,7 @@ app.MapGet("/contact", async (string? type, int id, AppDbContext db, InterestSer
                 if (!string.IsNullOrWhiteSpace(s.Facility!.BaleId)) items.Add(Item(ContactType.Bale, s.Facility.BaleId!));
             }
             if (items.Count == 0 && !string.IsNullOrWhiteSpace(s.SourceUrl)
-                && Uri.TryCreate(s.SourceUrl, UriKind.Absolute, out var ss))
+                && Uri.TryCreate(s.SourceUrl, UriKind.Absolute, out var ss) && ss.AbsolutePath.Trim('/').Length > 0)
             { fallbackUrl = s.SourceUrl; fallbackLabel = ss.Host.Contains("divar") ? "مشاهده شماره در دیوار ↗" : "مشاهده آگهی در منبع ↗"; }
             await interest.LogAsync(InterestEventType.Apply, id);
             break;
@@ -444,7 +444,7 @@ app.MapGet("/contact", async (string? type, int id, AppDbContext db, InterestSer
                 if (!string.IsNullOrWhiteSpace(j.Facility!.BaleId)) items.Add(Item(ContactType.Bale, j.Facility.BaleId!));
             }
             if (items.Count == 0 && !string.IsNullOrWhiteSpace(j.SourceUrl)
-                && Uri.TryCreate(j.SourceUrl, UriKind.Absolute, out var js))
+                && Uri.TryCreate(j.SourceUrl, UriKind.Absolute, out var js) && js.AbsolutePath.Trim('/').Length > 0)
             { fallbackUrl = j.SourceUrl; fallbackLabel = js.Host.Contains("divar") ? "مشاهده شماره در دیوار ↗" : "مشاهده آگهی در منبع ↗"; }
             await interest.LogJobAsync(InterestEventType.Apply, id);
             break;
@@ -458,7 +458,7 @@ app.MapGet("/contact", async (string? type, int id, AppDbContext db, InterestSer
             items.AddRange(t.Contacts.OrderBy(c => c.SortOrder).Select(c => Item(c.Type, c.Value)));
             if (items.Count == 0 && !string.IsNullOrWhiteSpace(t.Phone)) items.Add(Item(ContactType.Mobile, t.Phone!));
             if (items.Count == 0 && !string.IsNullOrWhiteSpace(t.SourceUrl)
-                && Uri.TryCreate(t.SourceUrl, UriKind.Absolute, out var su))
+                && Uri.TryCreate(t.SourceUrl, UriKind.Absolute, out var su) && su.AbsolutePath.Trim('/').Length > 0)
             { fallbackUrl = t.SourceUrl; fallbackLabel = su.Host.Contains("divar") ? "مشاهده شماره در دیوار ↗" : "مشاهده آگهی در منبع ↗"; }
             break;
         }

src/JobsMedical.Web/Services/Scraping/DivarListingSource.cs

@@ -62,7 +62,9 @@ public class DivarListingSource : IListingSource
                 var cityLabel = CityLabel(s.DivarCity);   // every result is from the city we searched
                 foreach (var (text, token) in Harvest(doc.RootElement).Take(25))
                 {
-                    var url = token is not null ? $"https://divar.ir/v/{token}" : "https://divar.ir";
+                    // Only a real post token gives a usable deep link. Without one, leave SourceUrl null —
+                    // a bare «https://divar.ir» just opens Divar's homepage, which is useless to the user.
+                    var url = token is not null ? $"https://divar.ir/v/{token}" : null;
                     var itemText = text;
                     // Stamp the city so the parser/AI always resolve a location (Divar's own location
                     // line isn't always in the search row; the searched city is authoritative).