feat: render markdown files as rendered markdown in view mode

[AleksandarCole]

Summary

• Markdown files (.md, .mdx, .markdown) are now rendered as proper markdown in the file viewer when the editor is read-only. Monaco is still used when the file is being edited and for every non-markdown file.
• Extracted the canvas console markdown renderer into a new shared MarkdownContent component (web_src/src/pages/app/Markdown.tsx) so the file viewer and the canvas console panels share one styling source (tables, <details>/<summary>, sanitization, etc).
• Refactored MarkdownBody (console panels) to only do {{ vars }} interpolation and delegate rendering to MarkdownContent, eliminating the duplicated MARKDOWN_CLASSES + sanitize schema.

Test plan

• Open a .md file in the canvas Files overlay without entering edit mode and confirm it renders as styled markdown (headings, lists, links, code blocks, tables, <details>).
• Enter edit mode and confirm the same file opens in Monaco for editing.
• Open a non-markdown file (e.g. .go, .yaml) and confirm Monaco continues to be used in both view and edit modes.
• Open a canvas markdown panel and confirm rendering is visually unchanged.

[superplanehq-integration]

👋 Commands for maintainers:

• /sp start - Start an ephemeral machine (takes ~30s)
• /sp stop - Stop a running machine (auto-executed on pr close)

[superplane-gh-integration-9000]

Docs Impact Review

The Files page should be updated to mention that Markdown files are displayed as rendered markdown in view mode.

Suggested docs updates:

• docs.superplane.com/concepts/files — In the Files tab section, add a note that .md files are rendered as formatted markdown (headings, tables, code blocks, etc.) when viewed, rather than shown as raw text.

Why: FileEditor.tsx now detects when a file has a .md extension and, in view/read-only mode, renders the content through the markdown pipeline instead of the Monaco editor. This is a visible, file-type-specific behavior change in the Files tab — users with markdown files in their app repository will see a fundamentally different output (rendered HTML vs. raw source), which is worth calling out in the docs rather than leaving to discovery.

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Maintainers: Reply with /docs-agree to open a tracking issue in superplanehq/docs (and assign it to you), or /docs-reject to dismiss this check.

Posted automatically by warp-gateway · commit a9cb5ae

[AleksandarCole]

/docs-reject

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