CONV-155: Implement completed state UI

[menvil]

• Completed state block: Done message, result filename, Download link, Change settings, Convert another
• Adds convertAnother() and convertWithDifferentSettings() to DashboardConverter
• Registers conversions.download route with DownloadConversionResultController stub (full security in CONV-159)
• 275/275 tests pass

🤖 Generated with Claude Code

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Summary by cubic

Implements the completed state UI in the dashboard converter with Download, Change settings, and Convert another actions. Connects the flow to a guarded download endpoint to let users fetch their converted file. Addresses CONV-155.

• New Features
  • Completed state block shows success message, result filename, and actions.
  • Added convertAnother() and convertWithDifferentSettings() to reset to upload or settings.
  • New conversions.download route with DownloadConversionResultController: checks ownership, completed status, file presence/expiry, and storage existence; streams the file with the correct MIME type.

^{Written for commit b13154d. Summary will update on new commits.}

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