Added Genre and Tags

AnimeAnnouncer.Web/Pages/Index.cshtml.cs

@@ -158,6 +158,42 @@ public class IndexModel : PageModel
             }
         }
 
+        // --- Genres & tags ---------------------------------------------------
+
+        /// <summary>How many tags are shown before the rest are tucked behind a "more" toggle.</summary>
+        public const int VisibleTagCount = 10;
+
+        /// <summary>
+        /// Genres from both sources, AniList first. TMDB's "Animation" genre is dropped since every
+        /// show on this page is anime, so it carries no information.
+        /// </summary>
+        public List<string> Genres => MergeDistinct(AnilistDetails?.Genres, CachedDetails?.Genres)
+            .Where(g => !string.Equals(g, "Animation", StringComparison.OrdinalIgnoreCase))
+            .ToList();
+
+        /// <summary>AniList tags followed by TMDB keywords, minus anything already listed as a genre.</summary>
+        public List<string> Tags
+        {
+            get
+            {
+                var genres = new HashSet<string>(Genres, StringComparer.OrdinalIgnoreCase);
+                return MergeDistinct(AnilistDetails?.Tags, CachedDetails?.Keywords)
+                    .Where(t => !genres.Contains(t))
+                    .ToList();
+            }
+        }
+
+        public List<string> VisibleTags => Tags.Take(VisibleTagCount).ToList();
+        public List<string> OverflowTags => Tags.Skip(VisibleTagCount).ToList();
+
+        private static IEnumerable<string> MergeDistinct(params IEnumerable<string>?[] sources) =>
+            sources
+                .Where(s => s != null)
+                .SelectMany(s => s!)
+                .Where(s => !string.IsNullOrWhiteSpace(s))
+                .Select(s => s.Trim())
+                .Distinct(StringComparer.OrdinalIgnoreCase);
+
         /// <summary>Anilist descriptions are HTML fragments; flatten them to plain text for display.</summary>
         public string? AnilistDescription
         {