Kylian Mbappe arrived in New Jersey with questions swirling around his season, but he left MetLife Stadium reminding everyone why the World Cup remains his stage. France’s 3-1 win over Senegal hinged on his brilliance, a sharp, decisive double that pushed him to the top of France’s all‑time scoring charts and set the tone for their Group I campaign.   France were flat in the first half, sluggish in possession and second-best in most duels. Senegal carved out the better chances, with Ismaïla Sarr and Nicolas Jackson both threatening. But once the break came and went, Mbappe shifted gears. The Real…