Reorganzing markdown files and UI fixes in card viewer

Chrono/Build/Program.cs

@@ -17,7 +17,7 @@ if (!Directory.Exists(docsDir))
     return 1;
 }
 
-var mdFiles = Directory.GetFiles(docsDir, "*.md");
+var mdFiles = Directory.GetFiles(docsDir, "*.md", SearchOption.AllDirectories);
 var cards = new List<CardData>();
 
 foreach (var file in mdFiles)
@@ -35,7 +35,7 @@ foreach (var file in mdFiles)
 
     var name = Path.GetFileNameWithoutExtension(file);
     var category = yaml.GetValueOrDefault("category");
-    if (category == null) continue;
+    if (category == null || category == "Deck") continue;
 
     var imageFile = StripWikiLink(yaml.GetValueOrDefault("imageLink"));
     if (imageFile != null && !imageFile.EndsWith(".png"))
@@ -67,13 +67,20 @@ foreach (var file in mdFiles)
 // Copy PNGs to wwwroot/cards
 var cardsDir = Path.Combine(webWwwRoot, "cards");
 Directory.CreateDirectory(cardsDir);
+
+var pngFiles = Directory.GetFiles(docsDir, "*.png", SearchOption.AllDirectories);
+var pngMap = pngFiles
+    .GroupBy(Path.GetFileName)
+    .ToDictionary(g => g.Key!, g => g.First(), StringComparer.OrdinalIgnoreCase);
+
 foreach (var card in cards)
 {
     if (card.ImageFile == null) continue;
-    var src = Path.Combine(docsDir, card.ImageFile);
-    var dst = Path.Combine(cardsDir, card.ImageFile);
-    if (File.Exists(src))
+    if (pngMap.TryGetValue(card.ImageFile, out var src))
+    {
+        var dst = Path.Combine(cardsDir, card.ImageFile);
         File.Copy(src, dst, true);
+    }
 }
 
 // Generate C# source file
@@ -120,7 +127,7 @@ Console.WriteLine($"Generated {cards.Count} cards in {generatedFile}");
 
 // ── Decks ──
 var decksDir = Path.Combine(docsDir, "Decks");
-var deckFiles = Directory.Exists(decksDir) ? Directory.GetFiles(decksDir, "*.md") : [];
+var deckFiles = Directory.Exists(decksDir) ? Directory.GetFiles(decksDir, "*.md", SearchOption.AllDirectories) : [];
 var decks = new List<DeckData>();
 
 foreach (var file in deckFiles)