CONV-110: Add estimated cost placeholder

[menvil]

CONV-110 — Add Estimated Cost Placeholder

Reserves space on the settings step for the future cost estimator — no billing logic.

• Static "Estimated cost" block: "Credit cost will be calculated before conversion."
• No hardcoded credit prices, no ConversionCostEstimator, no billing service.

Tests

• estimated cost placeholder copy renders on the settings step

composer test (231), lint, build pass.

🤖 Generated with Claude Code

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Summary by cubic

Adds a static "Estimated cost" placeholder to the settings step to satisfy CONV-110, reserving UI space for the future estimator without any billing logic.

• New Features
  • Bordered, muted block labeled “Estimated cost” with copy: “Credit cost will be calculated before conversion.”
  • Feature test asserts the placeholder renders on the settings step.

^{Written for commit 42c1dbb. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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• Commit unit tests in branch feature/CONV-110-add-estimated-cost-placeholder

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