[lexical-website] Bug Fix: Drop Vercel Analytics inject and unwrap chat input from flex parent

[mayrang]

Description

Two of the console errors reported in #8103 originate from this repo and can be fixed here. The third (staticdocs.thefacebook.com/ping failing to resolve, twice per navigation) is emitted by docusaurus-plugin-internaldocs-fb's internaldocsSetRedirect and has no opt-out in the preset config, so it's out of scope for this PR.

Lexical's flex + contentEditable warning

examples/website-chat/src/ChatInput.tsx had <ContentEditable> as a direct child of a flex row alongside <EmojiPlugin /> and the send button. LexicalEditor.setRootElement's dev-only check warns whenever the editor root's immediate parent computes to display: flex or inline-flex. Wrap the editable in a non-flex <div className="min-w-0 flex-1"> so the immediate parent is display: block. flex-1 min-w-0 on the wrapper preserves the original flex sizing for the input row.

Vercel Analytics 404

packages/lexical-website/src/pages/index.tsx calls inject() from @vercel/analytics on every page load, but /_vercel/insights/script.js returns 404 on the deployed site (Web Analytics isn't enabled on the Vercel project). This PR drops the import, the call, and the dependency, which is the simplest way to quiet the error without Vercel project access.

If the intent is actually to keep Vercel Analytics and enable it on the Vercel side, happy to revert this part — let me know.

Out of scope

staticdocs.thefacebook.com/ping fires from docusaurus-plugin-internaldocs-fb/module.js (NETWORK_TEST_URL constant, no plugin option to disable). Removing it would mean either patching the Meta-internal plugin or swapping presets, both larger than this PR.

Closes #8103 partially.

Test plan

• pnpm --filter @lexical/website docusaurus start — homepage loads, console no longer shows the Vercel Analytics 404 or the [Vercel Web Analytics] Failed to load script follow-up.
• Same dev server — focused and clicked across the chat input on the homepage; Lexical's display: flex warning no longer fires.
• Chat input layout unchanged in DevTools (emoji button + input + send button stay on the same row, input still fills available space).
• staticdocs.thefacebook.com/ping ×2 still present as expected (Meta-internal plugin, see Out of scope).
• tsc / prettier / eslint clean.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
lexical	Ready	Preview, Comment	May 14, 2026 5:21pm
lexical-playground	Ready	Preview, Comment	May 14, 2026 5:21pm