New user onboarding, recruiter email alerts for applications, and Echo interview reliability improvements

Getting Started checklist for new users New users now see a welcome walkthrough and a Getting Started checklist that tracks your progress — completing a job, running a sourcing search, submitting a scorecard, and more. Progress is saved across devices and survives a refresh, so you pick up exactly where you left off.
Email alert when a candidate applies The recruiter responsible for a job now receives an email as soon as a candidate applies — naming the candidate and the role, with a direct link to the application. The in-app notification is unchanged; this is an additional channel on top.

Echo interviews work for candidates without Google accounts AI-conducted interviews on Google Meet now open guest access automatically, so candidates without a Google account are admitted instead of being left waiting. If the access change can't be applied, a banner alerts you to reconnect your calendar.
Candidate no-shows are flagged on past interview cards When a candidate didn't join an Echo interview, the past-interview card now shows a clear alert — "Candidate missed this interview" — instead of presenting an empty recording as a completed meeting.

Echo can no longer be removed from its own interview A remove button was visible on AI-conducted interview cards that would strip Echo from the meeting it was running. That control is now hidden for Echo interviews, and the action is blocked on the backend as well.