Build an AI floor plan generator web app. 1) Project list with name, footprint size and last edited. 2) A parametric 2D canvas where walls are objects with start point, end point, thickness and openings for doors and windows, with snapping to 6 inch increments and live dimension labels. 3) A room tool that closes wall loops into rooms, names them, and computes square footage. 4) A furniture library of common items with real dimensions that can be dragged, rotated and validated for clearance against doors and other furniture. 5) A layout generator form for total square footage, number of bedrooms and bathrooms, open vs closed plan, and priorities such as natural light or storage, which calls an AI model that returns layout JSON with rooms, rectangles, adjacency and door positions, then renders three options side by side into the canvas. 6) A validation panel that lists problems such as overlaps, blocked door swings, rooms below minimum size, and windows in interior walls. 7) A summary screen with square footage per room, total, and a rough material estimate by room type. 8) Export to PNG and PDF with the project name and a design concept, not for construction notice, plus a public share link that opens read only. Store all plans as structured data, never as images.