feat: introduce @portabletext/plugin-one-line

[christianhg]

This commit sets up:

1. The initial repository infrastructure with GitHub workflows and Turbo tasks.
2. One-Line Plugin for PTE, ready to publish under the name @portabletext/plugin-one-line.
3. A very, very basic Portable Text Plugin Playground where you can toggle the One-Line Plugin on and off.

The repository infrastructure and the plugin source code is copy/pasted from https://github.com/portabletext/editor.

The commits does not set up:

1. Any tests.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	husky@​9.1.7
	@​typescript-eslint/​parser@​8.31.1
	babel-plugin-react-compiler@​19.0.0-beta-e993439-20250328
	@​types/​react-dom@​19.1.2
	racejar@​1.2.4
	@​sanity/​prettier-config@​1.0.3
	vitest@​3.1.2
	del-cli@​6.0.0
	@​types/​react@​19.1.2
	@​typescript-eslint/​eslint-plugin@​8.31.1
	@​vitest/​browser@​3.1.2
	@​ianvs/​prettier-plugin-sort-imports@​4.4.1
	vitest-browser-react@​0.1.1
	vite@​6.3.4
	react@​19.1.0
	prettier-plugin-gherkin@​3.1.2
	globals@​16.0.0
	turbo@​2.5.2
	pretty-quick@​4.1.1
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[Copilot]

Pull Request Overview

This PR introduces the @portabletext/plugin-one-line along with the initial repository infrastructure and a basic Portable Text Plugin Playground for toggling the new plugin.

• Sets up the initial repository infrastructure with GitHub workflows and Turbo tasks
• Implements the One-Line Plugin ready for publication
• Adds a basic Playground for testing the plugin functionality

Reviewed Changes

Copilot reviewed 34 out of 43 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
apps/playground/src/main.tsx	Adds the main entry point for the playground app
apps/playground/README.md	Provides a README for the Playground
.prettierrc.mjs	Introduces prettier configuration with custom plugins
.github/workflows/test-unit.yml	Configures unit test workflow
.github/workflows/test-browser.yml	Configures browser test workflow with caching for Playwright browsers
.github/workflows/release-please.yml	Sets up the release process through Release Please
.github/workflows/react-compiler.yml	Introduces workflow for maintaining React Compiler
.github/workflows/check-types.yml	Adds type checking workflow
.github/workflows/check-react-compiler.yml	Adds workflow for checking the React Compiler
.github/workflows/check-lint.yml	Configures lint check workflow
.github/workflows/check-format.yml	Configures format check workflow

Files not reviewed (9)

• .editorconfig: Language not supported
• .github/eslint-compact.json: Language not supported
• .github/renovate.json: Language not supported
• .npmrc: Language not supported
• .prettierignore: Language not supported
• LICENSE: Language not supported
• apps/playground/.gitignore: Language not supported
• apps/playground/index.html: Language not supported
• apps/playground/package.json: Language not supported