[Fix] Don't SSR the /free/[slug] chat shell

[CREDO23]

Summary

• Load /free/[slug] chat chrome client-only so SSG no longer touches document
• JSON-LD / FAQ still prerender

Test plan

• Unfixed 0.0.37 + SURFSENSE_BACKEND_INTERNAL_URL=https://api.surfsense.com pnpm run build dies on /free/gpt-5.4-mini-no-login (document is not defined)
• Same command with this change prerenders /free/gpt-5.4-mini-no-login and /free/gpt-o4-mini-no-login

High-level PR Summary

This PR fixes a Static Site Generation (SSG) build error caused by the chat shell trying to access document during server-side rendering. The solution disables SSR for the /free/[slug] chat interface by using Next.js dynamic imports with ssr: false, while preserving the prerendering of SEO-critical content like JSON-LD and FAQ sections. The chat providers (AnonymousModeProvider, LoginGateProvider, FreeLayoutDataProvider) are now wrapped in a client-only component, eliminating the layout.tsx file entirely.

⏱️ Estimated Review Time: 15-30 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_web/components/free-chat/free-chat-client.test.mjs
2	surfsense_web/components/free-chat/free-chat-client.tsx
3	surfsense_web/components/free-chat/free-chat-app.tsx
4	surfsense_web/app/(home)/free/[model_slug]/page.tsx
5	surfsense_web/app/(home)/free/[model_slug]/layout.tsx

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