add docusaurus-plugin-copy-page-button

[portdeveloper]

adds docusaurus-plugin-copy-page-button to dependencies + plugins array

since the rn docs site is basically the canonical docusaurus showcase, figured this might be worth dogfooding — it puts a "Copy page" button in the sidebar that exports the current page as clean markdown, plus one-click "Open in Claude / ChatGPT / Gemini" actions that prefill the markdown.

typical rn scenario this helps with: someone's on a specific component or API ref page and wants to drop it into an LLM to ask "how do I use this with [X library]" — instead of selecting around the page chrome or digging into the repo for the right .md file.

auto-injects into the TOC sidebar, theme-aware, no extra config.

shipping on Ethereum execution-apis, Sui, Walrus, Seal, SuiNS, Monad, Flare, Kaia, Nillion, Chronicle, Cardano and Arbitrum docs. listed in the Docusaurus community plugins page.

repo: https://github.com/portdeveloper/docusaurus-plugin-copy-page-button
npm: https://www.npmjs.com/package/docusaurus-plugin-copy-page-button (~10k installs/month)
demo: https://portdeveloper.github.io/copy-page-button-showcase/

happy to revert if it's not a fit

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[Simek]

Hey @portdeveloper, thanks for working on this addition! 👍

Some feedback:

• button does not show on pages without ToC or ToC hidden, i.e. https://deploy-preview-5085--react-native.netlify.app/docs/handling-text-input or https://deploy-preview-5085--react-native.netlify.app/docs/environment-setup
• button causes layout shift on page load, ideally we should preload it/make static, or set the correct height to the button container
• button and menu uses non-default docs font
• button sometimes does not load on first page render, you had to refresh page to see it
  

If required, feel free to swizzle some components.

[portdeveloper]

thanks for the detailed feedback @Simek — really useful. shipped 0.5.2 with fixes for all four:

1. no-ToC pages — injectToFallbackLocation used to drop the button as position: fixed in the top-right viewport corner, which was both ugly and brittle. now inserts inline after .theme-doc-breadcrumbs so pages like /docs/environment-setup and /docs/handling-text-input get the button at the top of the article column instead.

2. layout shift — reserved min-height: 56px on the sidebar-mode container so the slot is sized before React mounts. only partial — for a fully shift-free first paint we'd need an SSR-rendered placeholder via a swizzled TOC component, which is a bigger change. happy to do that next pass if you want it.

3. font — added font-family: var(--ifm-font-family-base, inherit) to the button and dropdown items. was inheriting browser default before.

4. first-render race — replaced the chained setTimeout polling with a MutationObserver on document.body that fires the moment the TOC or article mounts. periodic check kept as a safety net for @docusaurus/faster hydration patterns.

just bumped the PR to ^0.5.2. the Netlify preview should pick it up on the rebuild — would appreciate another look when you have a sec to confirm the four issues are gone.

(also FYI the changelog entry credits your feedback by name + links back here — feel free to push back if you'd rather not be cited.)