Search: Elasticsearch-style highlighted match snippets (results + typeahead)

- SearchHighlight.Snippet: extracts a ±70-char window around the first
  matching term and marks it (with ellipses) — the ES "highlight" fragment.
- Result cards (shift/job/talent) now show that snippet from the matched
  description/tags when a query is present, so you SEE where the term hit
  (e.g. «…دارای مدرک <mark>mmt</mark>…») instead of just the role.
- Typeahead suggestions gain a highlighted "sub" line (talent→tags,
  shift→city·specialty, job→facility·city) so matches show in the dropdown too.

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

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

@@ -34,6 +34,11 @@
     {
         <div class="row"><span class="badge badge-distance">📍 @JalaliDate.ToPersianDigits(km.ToString("0.#")) کیلومتر از شما</span></div>
     }
+    @{ var snip = JobsMedical.Web.Services.SearchHighlight.Snippet(Model.Description, q); }
+    @if (snip.Value.Length > 0)
+    {
+        <div class="search-snippet">@snip</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/_Layout.cshtml

@@ -259,8 +259,10 @@
                     .then(function (items) {
                         if (!items || !items.length) { hide(); return; }
                         var html = items.map(function (it) {
+                            var sub = it.sub ? '<span class="ns-sub">' + hi(it.sub, q) + '</span>' : '';
                             return '<a href="' + it.url + '"><span class="ns-type">' + esc(it.type) +
-                                '</span><span class="ns-label">' + hi(it.label, q) + '</span></a>';
+                                '</span><span class="ns-text"><span class="ns-label">' + hi(it.label, q) +
+                                '</span>' + sub + '</span></a>';
                         }).join('');
                         html += '<a class="ns-all" href="/Search?Q=' + encodeURIComponent(q) + '">همه نتایج برای «' + esc(q) + '» ←</a>';
                         box.innerHTML = html;

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

@@ -35,6 +35,11 @@
     }
     <div class="row">📅 @JalaliDate.WeekDayName(Model.Date)، @JalaliDate.ToLongDate(Model.Date)</div>
     <div class="row">🕐 @JalaliDate.Time(Model.StartTime) تا @JalaliDate.Time(Model.EndTime)</div>
+    @{ var snip = JobsMedical.Web.Services.SearchHighlight.Snippet(Model.Description, q); }
+    @if (snip.Value.Length > 0)
+    {
+        <div class="search-snippet">@snip</div>
+    }
     <partial name="_HourBar" model="Model" />
     <div class="foot">
         <span class="pay">@JalaliDate.PayLabel(Model.PayType, Model.PayAmount, Model.SharePercent)</span>

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

@@ -40,6 +40,11 @@
         }
     </div>
     <div class="row">📍 @Model.City?.Name@(area is not null ? "، " + area : "")</div>
+    @{ var snip = JobsMedical.Web.Services.SearchHighlight.Snippet(Model.Description ?? Model.Tags, q); }
+    @if (snip.Value.Length > 0)
+    {
+        <div class="search-snippet">@snip</div>
+    }
     @if (tags.Count > 0)
     {
         <div class="tag-chips">