Add March 16, 2026 changelog

[mintlify]

Summary

Adds this week's changelog entry covering product changes shipped since March 13, 2026:

• New contextual menu integrations: Google AI Studio, Devin, and Windsurf
• Open in editor from preview widget: Edit files directly from the preview widget
• Parameter anchor links in API playground: Hover to copy direct URLs to specific parameters
• Improvements: Slack app install from workflow page, dashboard Slack notifications for workflows, reorganized global settings docs

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Note

Low Risk
Low risk because this PR only updates changelog.mdx content (no product or runtime code changes). Risk is limited to potential typos or broken links in the new entry.

Overview
Adds a new March 16, 2026 <Update> entry to changelog.mdx, including RSS metadata and sections covering new contextual menu integrations (Google AI Studio/Devin/Windsurf), "Open in editor" from the preview widget, and parameter-level anchor links in the API playground.

Also documents workflow-related Slack improvements (install from workflow page and configure notifications in the dashboard) and notes a reorganization of the global settings docs.

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