Refactor identifiers and add subtitle UI

Assets/Scripts/Data/Identifiers/PuzzleIdentifiers.cs

@@ -1,23 +1,30 @@
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 
 namespace BriarQueen.Data.Identifiers
 {
     public enum PuzzleKey
     {
-        AshwickMarketGate,
+        AshwickOutskirtsGate,
     }
 
     public static class PuzzleIdentifiers
     {
-        public static readonly Dictionary<PuzzleKey, string> AllPuzzles = new()
-        {
-            { PuzzleKey.AshwickMarketGate, "CH1:Puzzle:AshwickMarketGate" },
-        };
+        private static readonly IReadOnlyDictionary<PuzzleKey, string> _allPuzzles =
+            new ReadOnlyDictionary<PuzzleKey, string>(
+                new Dictionary<PuzzleKey, string>
+                {
+                    { PuzzleKey.AshwickOutskirtsGate, "CH1:Puzzle:AshwickOutskirtsGate" },
+                });
+
+        public static string Get(PuzzleKey key)
+        {
+            return _allPuzzles.TryGetValue(key, out var value) ? value : string.Empty;
+        }
 
-        // Optional helper to get all puzzle IDs
         public static IEnumerable<string> GetAllPuzzleIDs()
         {
-            return AllPuzzles.Values;
+            return _allPuzzles.Values;
         }
     }
-}
+}