feat(anomalies): sort the feed (newest / top score / longest gap)

Adds a sort chip row to the anomaly feed — newest (default), highest score, or
longest suspension gap — replacing the fixed newest-first order. DetectedAt is the
tiebreak so order stays stable.

- AnomalySort enum + AnomalyFilter.Sort (default Newest, so existing constructions
  are unaffected); AnomalyBrowsingService applies it; feed sort chips +
  SetSort/SortLabel; en/ru resx.
- 2 tests: default newest-first + highest-score ordering.

src/Marathon.UI/Pages/Anomalies/AnomalyFeed.razor

@@ -99,6 +99,23 @@
             }
         </div>
 
+        <div class="m-list-toolbar__row m-list-toolbar__chips">
+            <span class="m-list-toolbar__label">@L["Anomaly.Filter.Sort"]</span>
+            @foreach (var sort in _sortOptions)
+            {
+                var localSort = sort;
+                var active = _filter.Sort == localSort;
+                <button type="button"
+                        class="m-chip @(active ? "is-active" : null)"
+                        aria-pressed="@active"
+                        data-test="sort-chip"
+                        data-sort="@localSort"
+                        @onclick="() => SetSort(localSort)">
+                    @SortLabel(localSort)
+                </button>
+            }
+        </div>
+
         <div class="m-list-toolbar__row">
             <div class="m-list-toolbar__group">
                 <label class="m-list-toolbar__label">@L["Anomaly.Filter.From"]</label>
@@ -198,6 +215,9 @@
     private static readonly AnomalyKind[] _kindOptions =
         { AnomalyKind.SuspensionFlip, AnomalyKind.SteamMove, AnomalyKind.SuspensionFreeze, AnomalyKind.OverroundCompression };
 
+    private static readonly AnomalySort[] _sortOptions =
+        { AnomalySort.Newest, AnomalySort.HighestScore, AnomalySort.LongestGap };
+
     private List<AnomalyListItem> _items = new();
     private IReadOnlyList<int> _availableSports = Array.Empty<int>();
     private bool _loading = true;
@@ -287,6 +307,16 @@
         _                                => kind.ToString(),
     };
 
+    private Task SetSort(AnomalySort sort) => UpdateFilter(_filter with { Sort = sort });
+
+    private string SortLabel(AnomalySort sort) => sort switch
+    {
+        AnomalySort.Newest       => L["Anomaly.Sort.Newest"],
+        AnomalySort.HighestScore => L["Anomaly.Sort.Score"],
+        AnomalySort.LongestGap   => L["Anomaly.Sort.Gap"],
+        _                        => sort.ToString(),
+    };
+
     private async Task OnFromChanged(ChangeEventArgs e)
     {
         if (DateTimeOffset.TryParse(e.Value?.ToString(), out var v))