feat(evaluations): Update cost tooltip for judges

[Ayush8923]

Summary

• Update the cost tooltip on /evaluations to include judge cost.
• Additions include:
  • New optional judge?: EvalCostEntry field in EvalCost (app/lib/types/evaluation.ts).
  • Render a Judge scoring row in the tooltip within EvalRunCard (app/components/evaluations/EvalRunCard.tsx) when job.cost.judge exists.
  • Ensure the new row matches the backend's cost breakdown order.

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran npm run dev and npm run build in the repository root and test.
• If you've fixed a bug or added code that is tested

Original PR description

Summary

The cost tooltip on /evaluations only listed Response generation cost, omitting the judge cost entry returned by the backend. This made the tooltip breakdown not add up to the displayed total_cost_usd whenever a run included judge scoring.

Changes

• EvalCost (app/lib/types/evaluation.ts) now includes an optional judge?: EvalCostEntry field alongside response and embedding.
• EvalRunCard (app/components/evaluations/EvalRunCard.tsx) renders a Judge scoring row in the cost tooltip when job.cost.judge is present, positioned between the existing "Response generation" and "Cosine similarity calculation" rows to match the backend's cost breakdown order.

Why

Response, judge, and embedding costs together make up total_cost_usd. Without the judge entry, users saw a total that didn't match the sum of the visible line items, causing confusion.

Closes #258

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[Ayush8923]

Not needed.