feat(theme-live-codeblock): reset button + wire position prop

[NPX2218]

Motivation

Adds a reset button to live code playgrounds that restores edited code to its original state. The button appears in the playground header alongside the Live Editor label.

Also wires properly the playground position prop

Closes #10711

Test Plan

CI + dogfood pages

Test links

• https://deploy-preview-11675--docusaurus-2.netlify.app/docs/markdown-features/code-blocks#interactive-code-editor

• https://deploy-preview-11675--docusaurus-2.netlify.app/tests/pages/live-playground-tests

Related issues/PRs

Closes #10711

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[NPX2218]

Hi @slorber @Josh-Cena ! Just wanted to gently ping this PR. All checks have passed, and I'm happy to make any changes if needed. Thanks for your time reviewing!

[socket-security]

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

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​docusaurus/​module-type-aliases@​3.9.2
	@​docusaurus/​preset-classic@​3.9.2
	@​docusaurus/​types@​3.9.2
	@​docusaurus/​core@​3.9.2
	react@​19.2.0
	@​mdx-js/​react@​3.1.1
	prism-react-renderer@​2.4.1
	react-dom@​19.2.0

View full report

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Build	Status	Details	Updated (UTC)
default (Inspect)	⚠️ Changes detected (Review)	4 changed, 1 added	Feb 19, 2026, 4:31 PM

[slorber]

LGTM now, but I had to do many changes, fix CI, and restore deleted but useful comments

This changes the display of the live codeblock header. Not sure all our users will appreciate that change, but I'm ok to get rid of the "dual color" header depending on the position. Next time please don't add a feature and change the design at the same time, it would be better to do both things in distinct PRs, easier to review.