Add ability to have a conversation with the AI assistant

[reakaleek]

Changes

• Add tabbed view for search and ask ai
• Instead of a single answer, you can now have a full conversation.

Screenshots

[Copilot]

Pull Request Overview

This PR implements a conversational AI feature for the documentation site, transforming the existing search modal from a simple search interface into a tabbed modal with both search and AI chat capabilities. The change adds the ability for users to have multi-turn conversations with an AI assistant about documentation topics.

Key changes:

• Refactored the modal from a single search interface to a tabbed system with "Search" and "Ask AI" tabs
• Implemented a complete chat system with message history, streaming responses, and conversation management
• Added comprehensive test coverage with 38 tests across 5 test files

Reviewed Changes

Copilot reviewed 30 out of 30 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
SearchOrAskAiModal.tsx	Converted from single search interface to tabbed modal with search and chat tabs
Chat.tsx	New chat interface component with message display, input handling, and conversation management
ChatMessage.tsx	Message rendering component supporting user/AI messages with streaming states and markdown
ChatMessageList.tsx	Container for rendering conversation history with proper message orchestration
StreamingAiMessage.tsx	Handles AI message streaming and LLM gateway integration
chat.store.ts	Zustand store for chat state management with conversation and message tracking
Search.tsx	New dedicated search component with AI handoff functionality
search.store.ts	Simplified search state store (moved to Search subdirectory)
modal.store.ts	Enhanced modal store to support tab mode switching
TESTING.md	Comprehensive testing documentation covering 38 tests
Various test files	Complete test coverage for stores and components
UI/styling updates	Font consistency, visual improvements, and icon additions

[github-actions]

🔍 Preview links for changed docs

• src/Elastic.Documentation.Site/Assets/web-components/SearchOrAskAi/TESTING.md

[Mpdreamz]

Great work, love the heavy investment on testing infra.