feat: introduce special power-up manager with inventory and associated UI

scripts/ui/powerup_inventory_ui.gd

@@ -84,6 +84,17 @@ func _setup_btn(effect_id: int, btn: Button):
 	
 		
 
+	# Add Cooldown Overlay
+	if not btn.has_node("CooldownOverlay"):
+		var overlay = ColorRect.new()
+		overlay.name = "CooldownOverlay"
+		overlay.mouse_filter = Control.MOUSE_FILTER_IGNORE
+		overlay.color = Color(0, 0, 0, 0.6) # Semi-transparent black
+		overlay.set_anchors_preset(Control.PRESET_FULL_RECT)
+		overlay.anchor_top = 1.0 # Start empty at bottom
+		overlay.grow_vertical = Control.GROW_DIRECTION_BEGIN
+		btn.add_child(overlay)
+
 	# Add Keyboard Shortcut Label
 	if not btn.has_node("ShortcutLabel"):
 		var sc_lbl = Label.new()
@@ -148,6 +159,21 @@ func _on_player_child_entered(node: Node, player_node: Node):
 		if player_node.child_entered_tree.is_connected(_on_player_child_entered):
 			player_node.child_entered_tree.disconnect(_on_player_child_entered)
 
+func _on_global_cooldown_updated(time_left: float, max_time: float):
+	for effect in icon_containers:
+		var btn = icon_containers[effect]
+		var overlay = btn.get_node_or_null("CooldownOverlay")
+		if overlay:
+			if time_left > 0:
+				overlay.visible = true
+				overlay.anchor_top = 1.0 - (time_left / max_time)
+				btn.disabled = true
+			else:
+				overlay.visible = false
+				overlay.anchor_top = 1.0
+				if special_manager_ref and special_manager_ref.inventory.get(effect, false):
+					btn.disabled = false
+
 func _connect_special_manager(special_manager):
 	special_manager_ref = special_manager
 	print("[PowerUpUI] Connected to SpecialTilesManager")
@@ -159,12 +185,14 @@ func _connect_special_manager(special_manager):
 	if not special_manager.is_connected("inventory_updated", _on_inventory_updated):
 		special_manager.connect("inventory_updated", _on_inventory_updated)
 		
+	if not special_manager.is_connected("global_cooldown_updated", _on_global_cooldown_updated):
+		special_manager.connect("global_cooldown_updated", _on_global_cooldown_updated)
+		
 	# Initial State Sync
 	if icon_containers.is_empty():
 		print("[PowerUpUI] Warning: Icon containers empty during setup. Attempting _ready logic now...")
 		var container = get_node_or_null("Container")
 		if container:
-			# Fix: Use correct IDs 0-3 here too
 			_setup_btn(0, container.get_node_or_null("SpeedBtn"))
 			_setup_btn(1, container.get_node_or_null("FreezeAreaBtn"))
 			_setup_btn(2, container.get_node_or_null("WallBtn"))
@@ -206,6 +234,11 @@ func _on_inventory_updated(inventory: Dictionary):
 		# Single slot logic: Only the owned one is visible
 		btn.visible = has_item
 		if has_item:
-			btn.disabled = false # Individual cooldown logic might disable it later
+			# Check global cooldown before enabling
+			var is_cooling = false
+			if special_manager_ref and special_manager_ref.global_cooldown_timer > 0:
+				is_cooling = true
+				
+			btn.disabled = is_cooling
 			btn.modulate = Color.WHITE
 			_update_btn_shortcut(effect, btn)