[ileodo]

Summary

• Let the demo load library source through a live Yarn link, and fix its blank page on the GitHub Pages path.
• Move the demo to Vite and React 19, update chart dependencies, and bump the library from 0.3.0 to 0.4.0.
• Restore compatible TypeScript ESLint dependencies so the lint check runs.

Checks

• npm ci --ignore-scripts — passed.
• yarn install --frozen-lockfile — passed.
• npm run lint — passed with a React version warning.
• npm run build — passed.
• cd demo && yarn build — passed with a chunk size warning.
• cd demo && ./node_modules/.bin/tsc --noEmit -p tsconfig.json — passed.
• git diff --check — passed.
• Opened the local demo in Chrome and confirmed the chart and controls render after reload.

Risks

• The demo requires Yarn 1 because npm does not support its link: dependency.
• The demo now uses React 19 and the library accepts React 17 through 19 as a peer dependency.