CONV-157: Implement failed state UI

[menvil]

• Failed state: user-friendly message, raw error NOT shown, Change settings + Try another file actions
• 276/276 tests pass

🤖 Generated with Claude Code

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Summary by cubic

Adds a failed state UI to the dashboard converter with a clear message and two recovery actions, without exposing raw errors. Meets CONV-157 requirements.

• New Features
  • Friendly "Conversion failed" panel; hides raw error.
  • Actions: Change settings (convertWithDifferentSettings) and Try another file (convertAnother).

^{Written for commit f901c14. Summary will update on new commits.}

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