feat: Implement core game systems including settings management, player input, and initial gameplay mechanics with associated UI.

scenes/player.gd

@@ -1012,6 +1012,20 @@ func activate_powerup(effect_id: int):
 		if st_manager:
 			st_manager.activate_effect(effect_id)
 
+func activate_held_powerup():
+	"""Finds whichever powerup is currently held and activates it."""
+	var active_effect = -1
+	if special_tiles_manager:
+		for effect_key in special_tiles_manager.inventory:
+			if special_tiles_manager.inventory[effect_key]:
+				active_effect = effect_key
+				break
+	
+	if active_effect != -1:
+		activate_powerup(active_effect)
+	else:
+		print("[Player] No powerup currently held to activate.")
+
 
 func _process(delta):
 	# Failsafe: Ensure player is visible if spawn point is selected and random spawn is active
@@ -1118,14 +1132,6 @@ func _physics_process(delta):
 # --------------------------------------------------------------------
 
 func _unhandled_input(event):
-	# Handle power-up usage
-	if event.is_action_pressed("use_powerup") and is_multiplayer_authority():
-		if is_frozen or is_stop_frozen:
-			return
-		if powerup_manager and powerup_manager.can_use_special():
-			powerup_manager.use_special_effect()
-		return
-	
 	if input_manager:
 		input_manager.handle_unhandled_input(event)