Add Appwrite React library docs and launch post

[atharvadeosthale]

Adds the /docs/products/auth/react hub, rewrites the React, Next.js, and TanStack Start quickstarts to use @appwrite.io/react, and ships an announcement post under blog/post/announcing-appwrite-react-library.
Also updates /docs/sdks and adds a "React library" entry to the Auth sidebar.

[appwrite]

Appwrite Website

Project ID: 69d7efb00023389e8d27

Sites (1)

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website 69d7f2670014e24571ca	Ready	View Logs	Preview URL

Website (appwrite/website)

Project ID: 684969cb000a2f6c0a02

Sites (1)

Site	Status	Logs	Preview	QR
website 68496a17000f03d62013	Queued	View Logs	Preview URL

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[greptile-apps]

Greptile Summary

This PR introduces the @appwrite.io/react library across Appwrite's docs, adding a new /docs/products/auth/react reference hub, rewriting the React, Next.js, and TanStack Start quickstarts to use the library's AppwriteProvider and hooks, and shipping an announcement blog post.

• New docs hub at /docs/products/auth/react covers the provider, all five auth hooks, server helpers, handler route configuration, and required API key scopes for both Next.js and TanStack Start.
• Quickstarts rewritten from raw Web SDK usage to the new library; each now includes an API key creation step, environment variable setup, handler route mounting, and an SSR-aware auth panel example.
• Blog post announces the library with working code snippets; the useAuth() hook usage is correctly placed inside a function component body.

Confidence Score: 5/5

Documentation-only change with no runtime code; safe to merge.

All changes are Markdoc documentation and AI prompt files. The SSR auth flow described (handler route, session cookie, server helpers) is internally consistent across the blog post, docs hub, and three quickstarts. No server-side secrets are exposed to the browser in any snippet, and the server-only boundary for @appwrite.io/react/server/* is clearly called out.

No files require special attention.

Important Files Changed

Filename	Overview
src/routes/blog/post/announcing-appwrite-react-library/+page.markdoc	New announcement blog post for the Appwrite React library; code snippets look coherent and the useAuth() usage is correctly wrapped inside a function component.
src/routes/docs/products/auth/react/+page.markdoc	New React library reference doc covering provider, hooks, server helpers, and handlers; admin.account.list() usage (previously flagged) is present.
src/routes/docs/quick-starts/react/+page.markdoc	Rewritten Vite/React quickstart now uses @appwrite.io/react; email input is missing type="email".
src/routes/docs/quick-starts/nextjs/+page.markdoc	Rewritten Next.js quickstart uses SSR session cookies and the new library; email input in auth-panel.tsx snippet is missing type="email".
src/routes/docs/quick-starts/tanstack-start/+page.markdoc	Rewritten TanStack Start quickstart; includes a helpful callout advising readers to move AppwriteProvider to __root.tsx for multi-route apps; email input missing type="email".
src/routes/docs/products/auth/+layout.svelte	Adds 'React library' sidebar entry with a new badge expiring 30 June 2026.
src/routes/docs/sdks/+page.markdoc	Adds React library 0.1.0 entry pointing to appwrite/sdk-for-react GitHub repo.

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