Approximate-location map on aggregated listings (Divar coords)

We captured Divar's privacy-fuzzed coords on RawListing but discarded them for
the listings that need them: unnamed-facility shifts/jobs dropped them (to avoid
piling on the shared placeholder) and applicants had no coordinate field at all.

- Add Lat/Lng to Shift, JobOpening, TalentListing (migration ListingApproxCoords).
- Publish stores the source ad's approx coords on each aggregated listing.
- Detail pages render the map from the listing's own coords (fallback: facility),
  and aggregated coords show as a shaded «محدودهٔ تقریبی» circle (not a precise
  pin) via _NeshanMap data-approx, with a disclaimer. Applicants get a map card
  (they had none) + the page now loads the Neshan key.

Only Divar provides coords; the map needs NeshanMapKey set in admin settings.
Existing rows get coords once reprocessed (RawListing already has them).

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

src/JobsMedical.Web/Pages/Jobs/Details.cshtml

@@ -4,6 +4,10 @@
     var j = Model.Job!;
     var f = j.Facility!;
     var jobContacts = (j.Contacts ?? new List<JobsMedical.Web.Models.ContactMethod>()).ToList();
+    // Map: listing's own approx coords (aggregated) then facility's; aggregated = approximate area.
+    var mapLat = j.Lat ?? f.Lat;
+    var mapLng = j.Lng ?? f.Lng;
+    var mapApprox = j.Source == JobsMedical.Web.Models.ShiftSource.Aggregated;
     ViewData["Title"] = j.Title;
     ViewData["Description"] = $"{j.Title} در {f.Name}، {f.City?.Name}. موقعیت استخدامی برای {j.Role?.Name}.";
     // Don't let Google index filled/expired openings (avoids dead "Job for jobs" results).
@@ -150,15 +154,15 @@
                 }
             </div>
 
-            @if (j.Facility?.Lat is not null && j.Facility?.Lng is not null)
+            @if (mapLat is not null && mapLng is not null)
             {
-                var latS = j.Facility.Lat.Value.ToString(System.Globalization.CultureInfo.InvariantCulture);
-                var lngS = j.Facility.Lng.Value.ToString(System.Globalization.CultureInfo.InvariantCulture);
+                var latS = mapLat.Value.ToString(System.Globalization.CultureInfo.InvariantCulture);
+                var lngS = mapLng.Value.ToString(System.Globalization.CultureInfo.InvariantCulture);
                 <div class="card card-pad" style="margin-top:16px;">
                     <h3 style="margin-top:0;">موقعیت مکانی</h3>
                     @if (!string.IsNullOrEmpty(Model.MapKey))
                     {
-                        <div id="facmap" data-lat="@latS" data-lng="@lngS" style="height:200px; border-radius:10px; overflow:hidden; border:1px solid var(--line);"></div>
+                        <div id="facmap" data-lat="@latS" data-lng="@lngS" data-approx="@(mapApprox ? "true" : "false")" style="height:200px; border-radius:10px; overflow:hidden; border:1px solid var(--line);"></div>
                     }
                     else
                     {
@@ -166,6 +170,10 @@
                             🗺️<br /><small class="muted" dir="ltr">@latS، @lngS</small>
                         </div>
                     }
+                    @if (mapApprox)
+                    {
+                        <p class="muted" style="font-size:12px; margin:8px 0 0;">📍 محدودهٔ تقریبی (برگرفته از آگهی منبع)؛ موقعیت دقیق نیست.</p>
+                    }
                     <a class="btn btn-outline btn-block" style="margin-top:8px;" target="_blank" rel="noopener"
                        href="https://neshan.org/maps/@(latS),@(lngS),16z">مسیریابی در نشان</a>
                 </div>
@@ -183,7 +191,7 @@
     </form>
 </div>
 
-@if (!string.IsNullOrEmpty(Model.MapKey) && Model.Job?.Facility?.Lat is not null)
+@if (!string.IsNullOrEmpty(Model.MapKey) && mapLat is not null)
 {
     <partial name="_NeshanMap" model="Model.MapKey" />
 }