Add total file size to export selected data summary

[frano-m]

Summary

• Add total file size to the selected data summary on the AnVIL export page
• Binds totalFileSize from the summary API response and formats it using formatFileSize

Closes #4738

Test plan

• Verify file size appears in the selected data summary on the cohort export page
• Verify file size is formatted in human-readable units (e.g., GB, TB)

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds the total file size returned by the AnVIL-CMG summary API to the “Export Selected Data” summary so users can see the total data volume being exported.

Changes:

• Bind totalFileSize from the summary API response into the export summary view model.
• Add a new summary key/label for file size and include it in the export summary map.
• Format the total size using formatFileSize.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
app/viewModelBuilders/azul/anvil-cmg/common/summaryMapper/summaryMapper.ts	Binds totalFileSize and adds a formatted “File Size” entry to the export summary.
app/viewModelBuilders/azul/anvil-cmg/common/summaryMapper/entities.ts	Extends FileSummary and SUMMARY to include the new file size summary field/key.
app/viewModelBuilders/azul/anvil-cmg/common/summaryMapper/constants.ts	Adds default value and display label for the new “File Size” summary row.

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