add snippet buttons in storage file viewer

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📝 Summary

The snippets to read file and download file were only present in the Tree viewer for Storage Inspector. For convenience, we can bring it to the File Viewer as well.

The icons have been changed too.

🔍 Description of Changes

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• Tests have been added for the changes made.
• Documentation has been updated where applicable, including docstrings for API changes.
• Pull request title is a good summary of the changes - it will be used in the release notes.

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Project	Deployment	Actions	Updated (UTC)
marimo-docs	Ready	Preview, Comment	Mar 17, 2026 1:31pm

[Copilot]

Pull request overview

Adds the existing “insert snippet” actions (read/download code snippets) to the Storage Inspector’s file viewer header, so users can insert common storage code while previewing a file (not only from the tree view).

Changes:

• Extend OpenFileInfo and StorageFileViewer props to carry protocol and backendType needed for snippet generation.
• Add snippet action buttons to StorageFileViewer and pass them into FilePreviewHeader.actions.
• Update StorageEntryRow open-file behavior to pass the additional context.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
frontend/src/components/storage/storage-inspector.tsx	Plumbs protocol/backendType through file-open state so the file viewer can build snippets.
frontend/src/components/storage/storage-file-viewer.tsx	Renders snippet buttons in the file preview header using STORAGE_SNIPPETS + useAddCodeToNewCell.

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