migrate-waniwani-sdk-0.15-to-0.16

Migrate a project from @waniwani/sdk 0.15.x to 0.16.0 and auto-apply every breaking change of that release: the typed useWaniwani track surface (string track()/step()/conversion()/capture and DOM auto-capture removed), the waniwani/widget tool-response meta key, the track.lead() removal, and the V2-envelope createTrackingRoute. Trigger when the user is on @waniwani/sdk 0.15.x and wants to move to 0.16, asks to…