fusion/.changeset/file-editor-markdown-preview.md

@gsxdsm/fusion

@gsxdsm/fusion
patch

Add markdown preview to file editor

The dashboard file editor now supports a preview mode for markdown files (.md, .markdown, .mdx). When viewing a markdown file, users can toggle between edit mode (textarea) and preview mode (rendered markdown) using Edit/Preview buttons. This follows the same pattern as the spec editor's view/edit toggle.

• Markdown files show Edit/Preview toggle buttons
• Preview mode renders using ReactMarkdown with GitHub-flavored markdown support
• Non-markdown files show only edit mode (no toggle)
• In read-only mode, markdown files default to preview mode with only the Preview button visible