Playground diff doesn't highlight folders where change happened

[timotheeguerin]

When everything is collapse you don't know where the change happened

[github-actions]

🎯 Issue Triage

In the playground's diff view, collapsed folders don't visually indicate that changes occurred within them, making it difficult to locate where changes happened.

Category: Feature Request

Area: ui:playground

🔍 Analysis

• The diff view in the TypeSpec playground collapses folders by default but does not propagate change indicators up to parent folders
• Users cannot tell which folders contain diffs without expanding each one manually
• Common pattern in file-tree diff UIs: show a badge or highlight on parent folders when child files have changes

📝 Suggested next steps

• When a file inside a folder has a diff, mark the folder node with a visual indicator (e.g., colored dot, badge, or highlighted text)
• Ensure the indicator is propagated recursively up to all ancestor folders

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