CONV-162: Add result expired UI handling

[menvil]

• FileRecord::isExpired() helper added
• FileRecordFactory::expired() state added
• Completed state shows 'This result has expired' + no Download button when result is expired
• 285/285 tests pass

🤖 Generated with Claude Code

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Summary by cubic

Adds an expired-result state to the dashboard converter so users see a clear message and no download option when a result file is past its expiration. Aligns with Linear CONV-162 by blocking expired downloads and prompting users to re-upload.

• New Features
  • Added FileRecord::isExpired() to check expiration via expires_at.
  • Added FileRecordFactory::expired() state for generating expired files in tests.
  • Updated completed step UI: shows “This result has expired” and hides Download; keeps “Convert another file”.
  • Added a feature test covering the expired state visibility and no-download behavior.

^{Written for commit b9daf0f. Summary will update on new commits.}

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• Commit unit tests in branch feature/CONV-162-add-result-expired-ui-handling

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