build(deps): refresh dependencies and React peer support

[gnapse]

Summary

• refresh direct dev dependencies and regenerate the lockfile, including the React 18.3.1 local baseline, TypeScript 6, and current linting/testing packages
• add explicit @testing-library/dom and @types/node so npm ci --legacy-peer-deps resolves the same way as local installs
• keep consumer compatibility centered on Todoist Web by making react the only peer dependency with a ^18.0.0 || ^19.0.0 range and dropping react-dom from peers
• keep the runtime code compatible with newer React typings by narrowing React.isValidElement in src/interpolate.tsx

Validation

• npm ci --legacy-peer-deps
• npm run check
• npm test
• npm run build

[doistbot]

This PR refreshes the repository's direct development dependencies and updates the React peer dependency range to target versions 18 and 19. These updates are a great step toward keeping the project aligned with modern ecosystem standards and ensuring smoother local installations. However, the proposed changes alter the published contract by dropping React 17 support and widening to React 19 without corresponding CI coverage, which introduces the risk of resolution failures for existing consumers and untested regressions.

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[rmartins90]

✅