B button launches upgrade menu

Assets/_Project/Scripts/UI/HUDController.cs

@@ -25,39 +25,41 @@ namespace TD.UI
 
         // ----- Inspector --------------------------------------------------
 
-        [Header("Scene References")]
+        [Header("Scene References")] [Tooltip("The local client's TowerPlacementController.")] [SerializeField]
-        [Tooltip("The local client's TowerPlacementController.")]
+        private TowerPlacementController placementController;
-        [SerializeField] private TowerPlacementController placementController;
 
         [Tooltip("The local client's TowerPaintController (drives the Paint tab + paint cursor).")]
         [SerializeField] private TowerPaintController paintController;
 
-        [Tooltip("The TowerPlacementManager NetworkObject in the scene.")]
+        [Tooltip("The TowerPlacementManager NetworkObject in the scene.")] [SerializeField]
-        [SerializeField] private TowerPlacementManager placementManager;
+        private TowerPlacementManager placementManager;
 
         [Tooltip("The local client's CameraController. Used by the minimap for click-to-jump " +
                  "and drag-to-pan.")]
-        [SerializeField] private CameraController cameraController;
+        [SerializeField]
+        private CameraController cameraController;
 
-        [Header("Settings")]
+        [Header("Settings")] [SerializeField] private float rejectionMessageDuration = 2.5f;
-        [SerializeField] private float rejectionMessageDuration = 2.5f;
 
         [Tooltip("Maximum visible height of the chat feed in pixels. Content past this " +
                  "height is clipped — older messages scroll off the top of the visible area " +
                  "but stay in history (scroll up while chat is open to view).")]
-        [SerializeField] private float chatMaxHeight = 280f;
+        [SerializeField]
+        private float chatMaxHeight = 280f;
 
         [Tooltip("Maximum messages kept in chat history. Defaults to effectively unlimited " +
                  "(int.MaxValue) — every message sent during a match stays scrollable. " +
                  "Lower the value if a long match ever shows DOM perf issues; this field " +
                  "is the safety valve, not a normal-play limit.")]
-        [SerializeField] private int chatMaxMessages = int.MaxValue;
+        [SerializeField]
+        private int chatMaxMessages = int.MaxValue;
 
-        [Tooltip("Color used for SYSTEM chat messages (e.g. 'Life Lost', income changes).")]
+        [Tooltip("Color used for SYSTEM chat messages (e.g. 'Life Lost', income changes).")] [SerializeField]
-        [SerializeField] private Color chatSystemColor = new Color(1f, 0.7f, 0.2f);
+        private Color chatSystemColor = new Color(1f, 0.7f, 0.2f);
 
         [Tooltip("Color used for PLAYER chat message bodies. Sender prefix uses the player's slot color.")]
-        [SerializeField] private Color chatPlayerColor = new Color(0.92f, 0.92f, 0.92f);
+        [SerializeField]
+        private Color chatPlayerColor = new Color(0.92f, 0.92f, 0.92f);
 
         // ----- Cached UI element references -------------------------------
 
@@ -72,6 +74,7 @@ namespace TD.UI
         private Label levelLabel;
         private VisualElement statLines;
         private VisualElement commandGrid;
+
         private VisualElement actionFrame;   // hidden via display:none when no actions are available
         private VisualElement commandTabs;   // Build/Paint tab row — shown only for a Builder selection
         private Button tabBuild;
@@ -79,6 +82,7 @@ namespace TD.UI
         private VisualElement buildProgressContainer;   // info-panel sub-view, shown for BuildSiteVisual selections
         private VisualElement buildProgressFill;        // width driven each frame from progress
         private Label         buildProgressPercent;
+
         private Label ttTitle;
         private Label ttDesc;
         private Label ttStats;
@@ -158,8 +162,13 @@ namespace TD.UI
             public readonly Key Key;
             public readonly VisualElement Button; // for enabledSelf gating
             public readonly System.Action Action;
+
             public HotkeyBinding(Key k, VisualElement b, System.Action a)
-            { Key = k; Button = b; Action = a; }
+            {
+                Key = k;
+                Button = b;
+                Action = a;
+            }
         }
 
         // ----- Static hit-test probe --------------------------------------
@@ -255,6 +264,7 @@ namespace TD.UI
 
             // Cache element references — log a warning for any that are missing
             // so UXML/USS mismatches surface immediately.
+
             goldLabel              = Require<Label>(root, "gold-label");
             waveLabel              = Require<Label>(root, "wave-label");
             livesLabel             = Require<Label>(root, "lives-label");
@@ -273,6 +283,7 @@ namespace TD.UI
 
             if (tabBuild != null)  tabBuild.clicked  += () => SwitchTab(CommandTab.Build);
             if (tabPaint != null)  tabPaint.clicked  += () => SwitchTab(CommandTab.Paint);
+
             buildProgressContainer = Require<VisualElement>(root, "build-progress");
             buildProgressFill = Require<VisualElement>(root, "build-progress-fill");
             buildProgressPercent = Require<Label>(root, "build-progress-percent");
@@ -357,6 +368,7 @@ namespace TD.UI
                 SelectionState.Instance.OnSelectionChanged -= HandleSelectionChanged;
                 selectionSubscribed = false;
             }
+
             if (matchStateSubscribed && MatchState.Instance != null)
             {
                 MatchState.Instance.OnPhaseChanged -= HandlePhaseChanged;
@@ -421,6 +433,7 @@ namespace TD.UI
                     buildProgressFill.style.width =
                         new StyleLength(new Length(progress * 100f, LengthUnit.Percent));
                 }
+
                 if (buildProgressPercent != null)
                 {
                     buildProgressPercent.text = $"{Mathf.RoundToInt(progress * 100f)}%";
@@ -653,6 +666,7 @@ namespace TD.UI
         // gated by the lobby), but the values do.
         private static readonly System.Text.StringBuilder s_scoreboardSigBuf =
             new System.Text.StringBuilder(64);
+
         private string ComputeScoreboardSignature(System.Collections.Generic.List<PlayerMatchState> players)
         {
             s_scoreboardSigBuf.Clear();
@@ -662,12 +676,14 @@ namespace TD.UI
                 var gm = PlayerGoldManager.GetForClient(pms.OwnerClientId);
                 int gold = gm != null ? gm.CurrentGold : 0;
                 int leaks = (wm != null && pms.Slot != PlayerSlot.None)
-                    ? wm.GetZoneLeakCount(pms.Slot) : 0;
+                    ? wm.GetZoneLeakCount(pms.Slot)
+                    : 0;
                 s_scoreboardSigBuf.Append((int)pms.Slot).Append(':')
                     .Append(pms.DisplayName ?? string.Empty).Append(':')
                     .Append(gold).Append(':')
                     .Append(leaks).Append(';');
             }
+
             return s_scoreboardSigBuf.ToString();
         }
 
@@ -754,7 +770,9 @@ namespace TD.UI
                         cells[i] = CreateTowerButton(def, typeId, HotkeyLayout[i]);
                         i++;
                     }
+
                 }
+                cells[GRID_MAX - 1] = CreateBuffMenuButton(HotkeyLayout[GRID_MAX - 1]);
             }
             else if (selection is TowerInstance tower)
             {
@@ -908,6 +926,7 @@ namespace TD.UI
                 costLabel.pickingMode = PickingMode.Ignore;
                 btn.Add(costLabel);
             }
+
             return btn;
         }
 
@@ -919,7 +938,10 @@ namespace TD.UI
             var btn = CreateActionButton(
                 costText: "", // tier cost unknown until upgrade system lands
                 hotkey: hotkey,
-                onClick:  () => { /* TODO: upgrade flow */ });
+                onClick: () =>
+                {
+                    /* TODO: upgrade flow */
+                });
             btn.SetEnabled(false);
             return btn;
         }
@@ -932,11 +954,22 @@ namespace TD.UI
             var btn = CreateActionButton(
                 costText: sellValue > 0 ? $"+{sellValue}g" : "",
                 hotkey: hotkey,
-                onClick:  () => { /* TODO: sell flow */ });
+                onClick: () =>
+                {
+                    /* TODO: sell flow */
+                });
             btn.SetEnabled(false);
             return btn;
         }
 
+        private VisualElement CreateBuffMenuButton(Key hotkey)
+        {
+            return CreateActionButton(
+                costText: "Buffs",
+                hotkey:   hotkey,
+                onClick:  () => ToggleBuffMenu());
+        }
+
         // Cancel action for an in-progress build. Fires the owner-only RPC; the
         // server cancels the matching job (or, for shelved sites, refunds + despawns
         // directly), full gold is refunded, the BuildSiteVisual is despawned, and