CONV-156: Add failed state test

[menvil]

Failing test: step=failed shows Conversion failed + Try another file, hides raw error message.

🤖 Generated with Claude Code

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Summary by cubic

Adds a test verifying the failed conversion state renders a friendly message and hides raw errors, aligning with CONV-156.
It asserts that "Conversion failed" and "Try another file" are shown, and the raw error "Imagick internal raw error" is not displayed.

^{Written for commit e8864f4. Summary will update on new commits.}

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