feat: add spline landing page and teal theme

[Nikhi-l]

Summary

• introduce landing page with embedded Spline scene and Try Demo button linking to chat
• shift chat UI to /chat route and update global palette to dark teal scheme
• add Spline dependency and theme color meta update

Testing

• pnpm lint (fails: Forbidden non-null assertion in lib/googleTokens.ts; Static Elements should not be interactive in components/webset-table.tsx)
• pnpm test (fails: This module cannot be imported from a Client Component module in lib/db/queries.ts)

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https://chatgpt.com/codex/tasks/task_e_68b28e1d7a688324bec6150062a8c6b7

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Project	Deployment	Preview	Comments	Updated (UTC)
cerch_ai	Error			Aug 30, 2025 5:50am

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

[P1] Update chat navigation targets to /chat

This commit moves the conversation UI behind /chat (see the new landing link) but the existing “New Chat” and sidebar logo handlers still push '/' in AppSidebar, SidebarHistory, and ChatHeader. After deploying this change those controls will redirect users to the marketing landing page instead of starting a fresh chat, effectively breaking the main entry point to the chat interface. All internal navigation that previously went to '/' needs to be updated to /chat.

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