Block escape/tab menu while loading locally (join sync + Loading phase)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Assets/Scripts/Components/UI/OverviewMenu.cs

@@ -103,6 +103,10 @@ public class OverviewMenu : MonoBehaviour
             matchResultScreen.Close();
         else if (_open)
             Close(resume: true);
+        // Loading (joining a session, or the pre-match Loading barrier): the scene/avatar is mid-setup,
+        // pausing or switching modes here corrupts the camera rigs - Esc/Tab do nothing.
+        else if (MatchManager.Instance && MatchManager.Instance.IsLoadingLocally)
+        { }
         // Paint mode: Esc exits back to the camera mode instead of opening the menu. Player Control
         // first; the hunter's role-scoped set has none, so it falls through to First Person.
         else if (gameMode && gameMode.EffectiveMode is PaintMode)