feat: add chat functionality with AI assistant and content indexing

[Sithumli]

• Implemented a content index watcher to automatically index markdown files.
• Created a chat widget component for user interaction with the AI assistant.
• Developed a chat page to handle user messages and display responses.
• Integrated Google Generative AI for generating responses based on user queries.
• Added API endpoint for chat interactions, including vector search for relevant content.
• Introduced new types for chat messages, requests, and responses to improve type safety.
• Enhanced user experience with loading indicators and markdown parsing for responses.

[Copilot]

Pull request overview

Adds an AI chat assistant experience (homepage “Ask Anything”, chat page, and floating widget) backed by a RAG pipeline that indexes site content into Upstash Vector and uses Google Gemini to generate answers.

Changes:

• Introduces chat UI surfaces (homepage AskAnything, dedicated chat page, and ChatWidget component).
• Adds /api/chat endpoint that performs vector search + Gemini streaming responses.
• Adds content indexing scripts (batch index + watch) and supporting types/constants/docs.

Reviewed changes

Copilot reviewed 17 out of 19 changed files in this pull request and generated 18 comments.

Show a summary per file

File	Description
template/src/types/index.ts	Re-exports new chat-related types.
template/src/types/constants.ts	Adds chat/indexing constants and role/type definitions.
template/src/types/chat.ts	Introduces request/response/context/vector typing for chat + indexing.
template/src/pages/index.astro	Adds the AskAnything section to the homepage.
template/src/pages/chat/[uid].astro	Adds a dedicated chat page with client-side streaming rendering.
template/src/pages/api/chat.ts	Adds chat API route integrating Upstash Vector + Google Gemini streaming.
template/src/components/Hero.astro	Removes CTA button markup from the hero section.
template/src/components/ChatWidget.astro	Adds a modal-based floating chat widget UI + streaming client.
template/src/components/AskAnything.astro	Adds homepage “Ask Anything” input that routes into chat.
scripts/index-watch.ts	Adds a dev watcher to re-index content on markdown changes.
scripts/index-content.ts	Adds a batch indexer with manifest-based incremental uploads.
package.json	Adds scripts/dependencies for indexing + AI services and changes build flow.
pnpm-lock.yaml	Locks new dependencies for AI/indexing/Vercel adapter.
astro.config.mjs	Adds Vercel adapter configuration.
README.md	Documents the new AI chat assistant feature and setup.
.gitignore	Ignores the indexing manifest.
.env.example	Provides env placeholders for Upstash + Gemini keys.
.changeset/plain-grapes-notice.md	Changeset for minor release.
.changeset/ai-chat-feature.md	Changeset describing the AI chat feature.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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Project	Deployment	Actions	Updated (UTC)
docubase	Ready	Preview, Comment	Mar 25, 2026 5:41pm