fix: #1846 reference canvas docs

[tomkis]

Summary

Adds missing reference to canvas docs

Linked Issues

Fixes #1846

Documentation

• No Docs Needed:

If this PR adds new feature or changes existing. Make sure documentation is adjusted accordingly. If the docs is not needed, please explain why.

[gemini-code-assist]

Summary of Changes

Hello @tomkis, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a documentation gap by integrating the Canvas documentation into the existing client SDK documentation and overall site navigation. The changes ensure that the Canvas UI extension is properly referenced and discoverable, improving the user experience for developers seeking information on this feature.

Highlights

• Documentation Link Update: The extensions.mdx file has been updated to include a direct hyperlink to the Canvas documentation page, making it easier for users to navigate to relevant information about the Canvas UI extension.
• Documentation Structure Integration: The docs.json file has been modified to incorporate the Canvas documentation page (development/agent-integration/canvas) into the main documentation structure, ensuring it appears in the sidebar navigation.

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[gemini-code-assist]

Code Review

This pull request correctly adds a reference to the Canvas documentation and updates the navigation. My review includes one suggestion to improve documentation consistency by adding links to other relevant items in the same list, which would enhance the user experience.

[jenna-winkler]

if we link to canvas here we should link to the others too