Build a full-stack Lead Tracking Dashboard web application using React, Node.js, Tailwind CSS, Express, and MongoDB. Implement an intuitive drag-and-drop Kanban pipeline board representing deal stages: New Leads, Contacted, Qualified, Proposal Sent, Closed Won, and Closed Lost. Create a detailed Lead Drawer component allowing sales representatives to log phone calls, add meeting notes, assign team members, and adjust deal financial values. Include a secure Inbound Webhook API route allowing external web forms and landing pages to push incoming lead records into the database automatically. Build a comprehensive Analytics view featuring interactive Recharts visualizations for conversion funnels, win/loss sales ratios, deal velocity, and monthly revenue forecasting. Ensure the application features robust filtering controls by sales owner, lead source, date range, and keyword search, along with CSV file import and export capabilities. Integrate SendGrid API to automatically dispatch automated follow-up email reminders when leads remain inactive for more than three days.