feat: Implement core game managers for power-ups, UI, goals, and player actions, and establish initial game scene and player.

scripts/managers/ui_manager.gd

@@ -97,6 +97,13 @@ func update_playerboard_ui():
 	if not local_player_character:
 		return
 	
+	# Center 3x3 slot indices in a 5x5 grid (0-indexed)
+	# Row 1: 6, 7, 8
+	# Row 2: 11, 12, 13
+	# Row 3: 16, 17, 18
+	var center_slots = [6, 7, 8, 11, 12, 13, 16, 17, 18]
+	var goals = local_player_character.goals if local_player_character.goals else []
+	
 	for i in range(25):
 		var slot = playerboard_ui.get_child(i)
 		
@@ -106,13 +113,43 @@ func update_playerboard_ui():
 			
 		var item = local_player_character.playerboard[i]
 		
+		# Default texture (empty)
 		slot.texture = item_tex[0]
+		slot.modulate = Color.WHITE
 		
-		match item:
-			7: slot.texture = item_tex[1]
-			8: slot.texture = item_tex[2]
-			9: slot.texture = item_tex[3]
-			10: slot.texture = item_tex[4]
+		# Check if this is a center slot that should show a goal
+		var center_index = center_slots.find(i)
+		if center_index != -1 and center_index < goals.size():
+			var goal_value = goals[center_index]
+			
+			# Check if player has collected this tile
+			var _has_tile = item == goal_value
+			
+			if item != -1:
+				# Player has a tile in this slot - show it at full brightness
+				match item:
+					7: slot.texture = item_tex[1]
+					8: slot.texture = item_tex[2]
+					9: slot.texture = item_tex[3]
+					10: slot.texture = item_tex[4]
+				slot.modulate = Color.WHITE
+			else:
+				# Show goal tile dimmed (not collected yet)
+				match goal_value:
+					7: slot.texture = item_tex[1]
+					8: slot.texture = item_tex[2]
+					9: slot.texture = item_tex[3]
+					10: slot.texture = item_tex[4]
+					_: slot.texture = item_tex[0]
+				# Dim uncollected goals with black overlay
+				slot.modulate = Color(0.3, 0.3, 0.3, 1.0)
+		else:
+			# Non-center slot - just show playerboard item normally
+			match item:
+				7: slot.texture = item_tex[1]
+				8: slot.texture = item_tex[2]
+				9: slot.texture = item_tex[3]
+				10: slot.texture = item_tex[4]
 
 func update_button_states():
 	if not local_player_character or local_player_character.is_in_group("Bots"):
@@ -184,7 +221,7 @@ func setup_powerup_bar_ui(main_node):
 				segment.add_theme_stylebox_override("panel", style)
 				powerup_segments.append(segment)
 
-func update_powerup_bar(current_points: int, max_points: int):
+func update_powerup_bar(current_points: int, _max_points: int):
 	"""Update battery segments based on current power-up points."""
 	var bars_filled = current_points / 4 # 4 points per bar
 	
@@ -201,9 +238,30 @@ func update_powerup_bar(current_points: int, max_points: int):
 		
 		segment.add_theme_stylebox_override("panel", style)
 
+var _previous_bars: int = 0
+
 func _on_powerup_points_changed(current: int, max_points: int):
+	var new_bars = current / 4
+	
+	# Detect if a new bar was filled
+	if new_bars > _previous_bars and powerup_bar:
+		# Pulse effect on newly filled segment
+		var segment_index = new_bars - 1
+		if segment_index >= 0 and segment_index < powerup_segments.size():
+			var segment = powerup_segments[segment_index]
+			_pulse_segment(segment)
+	
+	_previous_bars = new_bars
 	update_powerup_bar(current, max_points)
 
+func _pulse_segment(segment: Panel):
+	"""Create a visual pulse effect on a powerup segment."""
+	var original_scale = segment.scale
+	var tween = segment.create_tween()
+	tween.set_loops(2)
+	tween.tween_property(segment, "scale", Vector2(1.3, 1.3), 0.1).set_trans(Tween.TRANS_BACK).set_ease(Tween.EASE_OUT)
+	tween.tween_property(segment, "scale", original_scale, 0.15).set_trans(Tween.TRANS_SINE)
+
 # =============================================================================
 # Leaderboard UI
 # =============================================================================