LumenFull-Stack Canvas + Docs Workspace

A workspace that doesn't make you choose between structured docs and freeform thinking. Switch between a block editor and an infinite canvas — same app, same data, zero context switching. The docs side is a full block editor with headings, code blocks, images, todos, callouts, and comments. Every page can be shared publicly with a unique link. Flip to canvas mode and you get an infinite whiteboard with sticky notes, freehand drawing (pen, eraser, highlighter), and smooth pan/zoom. An AI sidebar powered by Gemini handles rewrites, summaries, brainstorming, and grammar fixes without leaving the editor. Auth, database, and row-level security are all Supabase. Updates are optimistic — UI moves first, debounced sync writes to Postgres 300ms later. The canvas drawing system uses raw HTML5 Canvas API with device pixel ratio scaling, no external drawing library. Everything runs on a single Next.js app with the App Router.