HUD: ability bar defaults hidden until a local player exists

Fixes the empty-bar leak into ArtStaging / menu / pre-connect: AbilityBarSystem.OnUpdate
early-returns when there is no valid NetworkTime, so the 'hide when no local player' line never
ran. Root now DisplayStyle.None at build, flips to Flex only when the local player is found —
also kills any pre-connect flash in gameplay.

Assets/_Project/Scripts/Client/Presentation/AbilityBarSystem.cs

@@ -81,12 +81,14 @@ namespace ProjectM.Client
 
             bool haveDb = SystemAPI.TryGetSingleton<AbilityDatabase>(out var db) && db.Value.IsCreated;
 
+            bool foundLocal = false; // no local player (menu / ArtStaging / pre-spawn) -> hide the bar entirely
             foreach (var (cd, dashCd, entity) in
                      SystemAPI.Query<RefRO<SocketCooldown>, RefRO<DashCooldown>>()
                          .WithAll<GhostOwnerIsLocal, PlayerTag>().WithEntityAccess())
             {
                 if (!EntityManager.HasBuffer<AbilitySocket>(entity) || !EntityManager.HasBuffer<EffectiveSocketStats>(entity))
                     continue;
+                foundLocal = true;
                 var sockets = EntityManager.GetBuffer<AbilitySocket>(entity, true);
                 var effs = EntityManager.GetBuffer<EffectiveSocketStats>(entity, true);
 
@@ -108,6 +110,7 @@ namespace ProjectM.Client
                 UpdateSlotCooldown(DashSlot, RemainingTicks(dashCd.ValueRO.NextTick, now), dashTotal);
                 break; // one local player
             }
+            _doc.rootVisualElement.style.display = foundLocal ? DisplayStyle.Flex : DisplayStyle.None;
         }
 
         static int RemainingTicks(uint nextFireRaw, NetworkTick now)
@@ -185,6 +188,7 @@ namespace ProjectM.Client
             root.style.position = Position.Absolute;
             root.style.left = 0; root.style.right = 0; root.style.top = 0; root.style.bottom = 0;
             root.pickingMode = PickingMode.Ignore;
+            root.style.display = DisplayStyle.None; // hidden until a local player is found (no flash in menu/ArtStaging/pre-connect)
 
             var bar = HudUi.Group(Align.Center);
             bar.style.position = Position.Absolute;