mindhaventaylor/trulyinbox-clone — reverse-engineered prompt

Build me a polished TrulyInbox style email warm up web app. I want a user to log in, land on a dashboard, see their trial status, and connect email accounts from Google, Microsoft, SMTP, or Saleshandy. The dashboard should show account cards, warm up progress, empty states, and a modal for adding a new account.

Please include pages for settings, billing, and cold email campaigns. Settings should let the user edit profile info, change password, and pick a timezone. Billing should show the current plan, trial countdown, usage numbers, available plans, and an upgrade modal. The cold emails page can be a Saleshandy integration showcase with feature highlights and a link out.

Use Next.js, TypeScript, and Tailwind. Keep it responsive and clean, with loading states and friendly errors. Use mock data and API routes instead of a real backend, including a simple login token flow and protected pages. Look up current docs online if you need to.