Dataset View: Fix multi-line CSV rendering #197

Is your feature request related to a problem?
Datasets with multi-line answers render incorrectly in the evaluation Dataset View modal. A 5-row CSV is shown as 43 rows, with answer fragments spilling into wrong
cells/columns. The data itself is correct (Langfuse upload works) — only the in-app preview breaks.

S3 URL: s3://ai-platform-documents-staging/67e2e6fc-ed4a-41e0-aab7-7b06cb20503b/1c541f73-d880-4009-acbd-814599a99249

Note: Checked the presigned URL so the file is saved correctly in S3 and it's just the UI bug

Kaapi Konsole UI

Original CSV

Describe the solution you'd like
Fix the Dataset View so CSVs with multi-line answers display correctly:

• Multi-line answers stay intact within a single cell
• Correct row and column counts
• No phantom rows or columns