CONV-234: Show real estimated cost in settings step

[menvil]

Summary

• DashboardConverter now calculates and shows real estimated credit cost in settings step
• Cost is calculated via EstimateConversionCostAction when target format is selected
• Blade template updated to show cost instead of static placeholder
• InsufficientCreditsException is now caught in convert() with user-friendly error message

Test plan

• DashboardConverterCostTest passes (2 tests: PDF shows 2 credits, JPG shows 1 credit)
• All 126 Livewire tests pass (no regression)

🤖 Generated with Claude Code

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Summary by cubic

Implements CONV-234 by showing the real estimated credit cost in the settings step. The UI now displays the cost as soon as a target format is selected, so users know the required credits before converting.

• New Features
  • Calculate cost via EstimateConversionCostAction on target format selection and store it as estimatedCreditCost.
  • Replace the placeholder with the actual cost in the settings step (handles singular/plural).
  • Catch InsufficientCreditsException in convert() and show a clear message with the required credits.
  • Reset estimatedCreditCost when target selection is cleared.

^{Written for commit 8d06c8a. 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-234-show-real-estimated-cost-in-settings-step

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