CONV-235: Add insufficient credits UI state

[menvil]

Summary

• Adds 'Not enough credits' error block in the convert step when credits are insufficient
• Fixes all remaining ProcessConversionJob::handle() calls to pass the new CreditLedger argument
• Fixes lint issues across Phase 15 files

Test plan

• DashboardConverterCostTest passes (3 tests: shows 2 credits, shows 1 credit, insufficient credits blocks job)
• All 425 tests pass
• composer lint passes
• npm run build passes

🤖 Generated with Claude Code

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Summary by cubic

Adds an insufficient credits UI in the convert step and blocks job creation when the balance can’t cover the estimated cost. Addresses CONV-235 by clearly signaling the issue and preventing failed conversions.

• New Features

  • Show an inline “Not enough credits” error in the convert step with a helpful message.
  • Prevent creating and queueing conversion jobs when credits are below the estimated cost.

• Bug Fixes

  • Pass CreditLedger to all ProcessConversionJob::handle() calls to align with the new signature.
  • Minor lint/import cleanups and test updates for consistent assertions.

^{Written for commit b969ca1. 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-235-add-insufficient-credits-ui-state

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