Restrict speed boost to space

surface/PlanetSurfaceController.gd

@@ -27,6 +27,10 @@ var transitioning: bool = false
 func _ready() -> void:
 	var planet_definition: Resource = PLANET_DEFINITIONS.get_definition(GameState.planet_definition_id)
 	_compose_surface(SURFACE_PROFILES.get_profile(planet_definition.surface_profile_id))
+	# The Distorder's sustained travel boost is a space-navigation tool. A
+	# landing always returns the fleet to normal surface speed; the separate
+	# aimed dash remains available through its own ability button.
+	GameState.set_fleet_speed_multiplier(1.0)
 	fleet.spawn_ships(GameState.surviving_ship_count, Vector2.ZERO,
 		GameState.surviving_vessel_types)
 	camera.position = Vector2.ZERO