Content manager for eink signage. Rewrite of the original Flask app as a Next.js app on Vercel with MongoDB. Every page renders to a crisp 1-bit BMP that the device can pull over HTTP.

• Multi-device support — register any screen size, with presets for common Waveshare panels (2.13", 2.9", 4.2", 7.5", 10.3").
• Layout editor — drag/resize blocks on the actual device canvas, snap grid, canned 2×2 / 3×2 / 4-across grids.
• Three block types: Text, Image, Asset (reusable sub-layout).
• Image upload → crop (aspect-locked to target block) → resize → threshold or Floyd–Steinberg dither → stored as a 1-bit PNG on the block.
• Text blocks: font size/family/align, soft character limit with overflow warning, bold, inversion.
• Reusable assets (building blocks) — e.g. an "event card" with its own text + image layout that you drop into multiple devices.
• Byte-accurate preview (we render the same pipeline that produces the BMP).
• Per-device public pull URL:
  • GET /<slug>/current.bmp → 1-bit BMP
  • GET /<slug>/current.png → same image as PNG (for debugging)
• Password-protected CMS (single shared password from .env).

• Next.js 14 (App Router, TypeScript) — runs fine on Vercel
• MongoDB (Atlas recommended in prod; mongodb://localhost works locally)
• @napi-rs/canvas for server-side rendering
• Tailwind for UI

cp .env.example .env
# fill MONGODB_URI, MONGODB_DB, APP_PASSWORD, SESSION_SECRET

npm install
npm run dev

Open http://localhost:3000 → log in with APP_PASSWORD.

1. Push this branch.
2. vercel → import the project (framework auto-detected as Next.js).
3. In the Vercel project settings, set the env vars above.
4. Use MongoDB Atlas (free tier works). Whitelist 0.0.0.0/0 or Vercel egress CIDRs.
5. On the device, pull https://<your-app>.vercel.app/<slug>/current.bmp on whatever refresh cadence your firmware supports.

curl -o current.bmp https://eink-cms.example.com/lobby/current.bmp

The endpoint is not authenticated, so keep slugs unguessable if you care.

The original Flask app is archived in legacy/ for reference.