fix(demo): auto-install demo deps in root dev script

[adeelraza]

Summary

Fixes #8 — a fresh clone fails to start the demo with the root dev script.

The root dev script delegated to the demo's vite (npm --prefix demo run dev) without ensuring the demo's dependencies were installed. Because the root and demo/ are separate npm projects (no workspaces; demo/ has its own package.json + lockfile), a root npm install never installs @vitejs/plugin-react — which demo/vite.config.ts imports at config-load time.

Result on a fresh clone:

npm install
npm run dev
# → Cannot find package '@vitejs/plugin-react'

Fix

Prepend an idempotent install to the root dev script:

- "dev": "npm --prefix demo run dev",
+ "dev": "npm --prefix demo install && npm --prefix demo run dev",

• Idempotent — npm no-ops when demo deps already match the lockfile, so repeat runs stay fast.
• Mirrors the existing netlify-build script, which already runs cd demo && npm install before building.

The README and CONTRIBUTING docs already document cd demo && npm install && npm run dev, so this change closes the gap for the root-level dev script specifically.

Test plan

• Fresh clone → npm install (root) → npm run dev starts the demo without a separate cd demo && npm install.

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Project	Deployment	Actions	Updated (UTC)
react-image-editor	Ready	Preview, Comment	Jul 28, 2026 1:57pm