Enhance year parsing logic in HsnTsnClient; implement ParseBestYearRange method for improved accuracy

src/HsnTsnScraper/HsnTsnClient.cs

@@ -127,8 +127,14 @@ public sealed class HsnTsnClient : IDisposable
             CanonicalUrl = doc.DocumentNode.SelectSingleNode("//meta[@property='url']")?.GetAttributeValue("content", string.Empty).Trim() ?? string.Empty
         };
 
-        var yearText = HtmlEntity.DeEntitize(doc.DocumentNode.SelectSingleNode("//small[@property='vehicleModelDate']")?.InnerText ?? string.Empty).Trim();
-        ParseYearRange(yearText, out var fromYear, out var toYear);
+        var yearTexts = new[]
+        {
+            HtmlEntity.DeEntitize(doc.DocumentNode.SelectSingleNode("//small[@property='vehicleModelDate']")?.InnerText ?? string.Empty).Trim(),
+            HtmlEntity.DeEntitize(doc.DocumentNode.SelectSingleNode("//title")?.InnerText ?? string.Empty).Trim(),
+            HtmlEntity.DeEntitize(doc.DocumentNode.SelectSingleNode("//h1")?.InnerText ?? string.Empty).Trim()
+        };
+
+        ParseBestYearRange(yearTexts, out var fromYear, out var toYear);
         detail.YearFrom = fromYear;
         detail.YearTo = toYear;
 
@@ -292,6 +298,40 @@ public sealed class HsnTsnClient : IDisposable
         }
     }
 
+    private static void ParseBestYearRange(IEnumerable<string> candidates, out int? fromYear, out int? toYear)
+    {
+        fromYear = null;
+        toYear = null;
+
+        foreach (var text in candidates)
+        {
+            if (string.IsNullOrWhiteSpace(text))
+            {
+                continue;
+            }
+
+            ParseYearRange(text, out var currentFrom, out var currentTo);
+            if (currentFrom is null)
+            {
+                continue;
+            }
+
+            if (fromYear is null)
+            {
+                fromYear = currentFrom;
+                toYear = currentTo;
+                continue;
+            }
+
+            // Prefer a range that includes both endpoints over a single year.
+            if (toYear is null && currentTo is not null)
+            {
+                fromYear = currentFrom;
+                toYear = currentTo;
+            }
+        }
+    }
+
     private static string ExtractBrand(string vehicleType)
     {
         if (string.IsNullOrWhiteSpace(vehicleType))