felipecorrea0/LeadFlow-CRM-B2B ? reverse-engineered prompt

Build me a simple CRM for B2B leads with a visual kanban board, so I can track prospects from new lead to contacted, proposal sent, and closed. I want to be able to add, edit, and move leads between stages by dragging them, see the total pipeline value update automatically at the top, and open a WhatsApp chat from each lead with a prefilled message.

Each lead should also have a timeline or notes area where I can record conversations and follow ups over time. Please include login and protected access so each user only sees their own data, and save everything properly in the database. Keep the interface clean and modern, mobile friendly if possible, and make the app feel fast and easy to use. If you need to check current docs for any libraries, look them up online.