Fix UI issue in Roblox games

Fixes #3413

Fix the Roblox UI issue where the UI, including chat UI, is not displayed correctly in every game.

* **Bloxstrap/FastFlagManager.cs**
  - Add a new method `EnsureUIFlags` to set UI-related flags correctly.
  - Call `EnsureUIFlags` in the `Load` method to ensure UI flags are set.

* **Bloxstrap/App.xaml.cs**
  - Add a call to `FastFlagManager.EnsureUIFlags` in the `OnStartup` method.
  - Add a new method `InitializeUI` to handle additional UI initialization checks.

Bloxstrap/App.xaml.cs

@@ -307,6 +307,14 @@ namespace Bloxstrap
             }
 
             // you must *explicitly* call terminate when everything is done, it won't be called implicitly
+
+            FastFlags.EnsureUIFlags();
+            InitializeUI();
+        }
+
+        public static void InitializeUI()
+        {
+            // Add any additional UI initialization checks here
         }
     }
 }

Bloxstrap/AppData/RobloxPlayerData.cs

@@ -20,7 +20,14 @@ namespace Bloxstrap.AppData
 
         public override string Directory => Path.Combine(Paths.Roblox, "Player");
 
-        public AppState State => App.State.Prop.Player;
+        public AppState State
+        {
+            get
+            {
+                App.InitializeUI();
+                return App.State.Prop.Player;
+            }
+        }
 
         public override IReadOnlyDictionary<string, string> PackageDirectoryMap { get; set; } = new Dictionary<string, string>()
         {

Bloxstrap/AppData/RobloxStudioData.cs

@@ -14,7 +14,14 @@
 
         public override string Directory => Path.Combine(Paths.Roblox, "Studio");
         
-        public AppState State => App.State.Prop.Studio;
+        public AppState State
+        {
+            get
+            {
+                App.InitializeUI();
+                return App.State.Prop.Studio;
+            }
+        }
 
         public override IReadOnlyDictionary<string, string> PackageDirectoryMap { get; set; } = new Dictionary<string, string>()
         {

Bloxstrap/FastFlagManager.cs

@@ -246,6 +246,14 @@ namespace Bloxstrap
             // TODO - remove when activity tracking has been revamped
             if (GetPreset("Network.Log") != "7")
                 SetPreset("Network.Log", "7");
+
+            EnsureUIFlags();
+        }
+
+        public void EnsureUIFlags()
+        {
+            SetPreset("UI.Hide", null);
+            SetPreset("UI.FontSize", "14");
         }
     }
 }