CONV-165: Add empty state

[menvil]

Summary

• Adds query to fetch current user's conversion jobs (scoped, with eager loading)
• Shows "No conversions yet / Upload a file to start converting" empty state when user has no jobs

Test plan

• shows empty state when user has no conversions
• composer test passes (293 tests)
• composer lint passes
• npm run build passes

🤖 Generated with Claude Code

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Summary by cubic

Adds an empty state to the Recent Conversions table when a user has no conversion jobs, fulfilling Linear CONV-165. The component now queries the current user's ConversionJobs with eager-loaded sourceFile and resultFile to drive the UI.

^{Written for commit f36a5de. 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-165-add-empty-state

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