CONV-093: Add back navigation from format step

[menvil]

CONV-093 — Add Back Navigation From Format Step

Adds back navigation between the upload summary, format, and settings steps without destroying the uploaded file.

Changes

• backToUploadSummary() — returns to the upload step, preserves currentFileId, and resets the target selection (so a stale target can't survive). Falls back to a clean upload state if the file is gone.
• backToFormatStep() — returns from the settings placeholder to the format step, preserving the file and the selected target highlight (no reset).
• Upload step now renders an uploaded file summary (filename, Replace/Remove, "Choose format") when a file is preserved; otherwise the dropzone.
• "← Back" buttons added to the format and settings steps.

Tests

• Back from format → upload summary keeps the file (and the FileRecord is not deleted) and shows image.png.
• Back to upload summary resets the selected target.
• Back from settings → format preserves the file and shows the cards.
• Back with a missing file returns to a clean upload step.

composer test (196), composer lint, npm run build all pass.

🤖 Generated with Claude Code

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Summary by cubic

Adds back navigation across the upload summary, format, and settings steps, preserving the uploaded file and preventing stale target selections. Aligns with Linear CONV-093 to improve the flow without forcing re-upload.

• New Features
  • Back to upload summary preserves the file and clears the selected target; if the file is missing, returns to a clean upload state.
  • Back from settings to format preserves the file and the target highlight.
  • Upload step shows an uploaded file summary (name, size, Replace/Remove, “Choose format”) when a file exists; otherwise shows the dropzone.
  • “← Back” buttons added to the format and settings steps.

^{Written for commit 0f817ef. 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-093-add-back-navigation-from-format-step

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