CONV-149: Add duplicate convert protection

[menvil]

• Guard in convert(): returns early if step=converting or currentConversionJobId is set
• Convert Now button added to step=convert in Blade with wire:loading.attr=disabled
• Test: double convert() call creates only 1 ConversionJob

🤖 Generated with Claude Code

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Summary by cubic

Prevent duplicate conversions by guarding convert() and disabling the Convert Now button while starting. Aligns with CONV-149 to ensure only one ConversionJob is created per action.

• Bug Fixes
  • Added early return in convert() when $step === 'converting' or currentConversionJobId is set.
  • Added "Convert Now" button for the convert step with wire:loading.attr="disabled" and :disabled="$step === 'converting'"; shows “Starting…” while loading.
  • Added a feature test to verify repeated convert calls create only one ConversionJob.

^{Written for commit a2678a7. Summary will update on new commits.}

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