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backstage release v0.126.0

Apr 30, 2026 Developer Portal backstage v0.126.0

Added

Added configuration options to allow for persisting the SQLite database.
Add Mermaid diagram support to AI chat markdown rendering.
Render <details>/<summary> HTML in AI chat markdown.
Allow AI chat MCP servers to act as the logged-in Backstage user via the new useBackstageUserToken option, so user-context tools like auth.who-am-i work without a static external-access token.

Changed

Strip reasoning content from past AI chat assistant messages to reclaim context tokens for Claude conversations.
Replace the fa-kubernetes Font Awesome icon with an inline SVG and remove the Font Awesome kit integration.
Replace @terasky/backstage-plugin-catalog-mcp-backend with the built-in catalog.query-catalog-entities action from @backstage/plugin-mcp-actions-backend.

Fixed

Fix AI chat input freezing after typing dead keys (e.g., backtick on German keyboard).

Removed

Remove the custom getCurrentUserInfo AI chat agent tool, superseded by the upstream auth.who-am-i tool from the mcp-actions MCP server. See ./docs/releases/v0.126.0-changelog.md for more information.