CONV-084: Add format step guard

[menvil]

CONV-084 — Add Format Step Guard

Guards the format step so users cannot reach target-format selection without an uploaded file.

Changes

• Add goToFormatStep() — opens format step only when a current FileRecord exists; otherwise clears stale currentFileId and returns to upload.
• Add ensureValidStep() — defensive guard that snaps back to upload if step === 'format' but no current file.

Tests

• Format step cannot be opened without an uploaded file.
• Missing/stale currentFileId returns user to upload step.
• Format step opens when a current file exists.

composer test (178), composer lint, npm run build all pass.

🤖 Generated with Claude Code

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Summary by cubic

Implements CONV-084 by guarding the format step so users can’t reach it without an uploaded file. Missing or stale current files now redirect back to upload.

• Bug Fixes
  • Added goToFormatStep(): open format only if a current file exists; otherwise clear currentFileId and go to upload.
  • Added ensureValidStep(): if step is format but no current file, snap back to upload.
  • Tests cover blocking access without a file, handling stale IDs, and the valid path.

^{Written for commit b5ffc3d. Summary will update on new commits.}

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