feat: load editor json from URL params

[mondseon]

Summary

• Load the editor's initial JSON from a json URL query parameter when present
• Fall back to the existing example JSON when the parameter is absent
• Add unit and e2e coverage for the URL parameter flow

Example

/editor?json=%7B%22hello%22%3A%22world%22%7D

Tests

• pnpm vitest run __tests__/editorUrl.test.ts
• pnpm tsc --noEmit
• pnpm exec prettier --check src/containers/editor/editor/Editor.tsx src/containers/editor/editor/url.ts __tests__/editorUrl.test.ts e2e/tests/editor.spec.ts
• pnpm exec next lint --file src/containers/editor/editor/Editor.tsx --file src/containers/editor/editor/url.ts

[loggerhead]

Thanks for the PR!

[mondseon]

Thanks for merging! I noticed json4u.com supports the new json URL parameter now, but json4u.cn still seems to serve the previous version. Is the .cn deployment updated separately?

[loggerhead]

Thanks for the reminder. I forgot that .cn requires manual deployment. It's been deployed just now.