CONV-168: Add file size column

[menvil]

Summary

• Adds Size column: shows result file size when available, falls back to source file size
• formatBytes helper uses SI units (1000-based): KB, MB, GB
• Null size handled as —

Test plan

• renders result file size when result file exists
• renders source file size when no result file
• composer test passes (297 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Adds a Size column to Recent Conversions to show file sizes in SI units. Addresses Linear CONV-168 by showing the result file size when available, otherwise the source file size; unknown sizes show "—".

• New Features
  • Added Size column to the recent conversions table.
  • formatBytes formats sizes in 1000-based KB/MB/GB and handles null as —.

^{Written for commit e48b462. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-168-add-file-size-column

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