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Bug fix / enhancement to an existing Studio import flow. ## What is the current behavior? Studio currently supports converting empty CSV cells to `NULL`, but the behavior applies across all imported columns. That makes it impossible to preserve empty strings in some columns while still treating empty cells as `NULL` in others. This follows up on the earlier CSV import fix discussed in #43281, which addressed the underlying issue reported in #43258. ## What is the new behavior? This PR updates the CSV import flow so users can choose exactly which imported columns should convert empty cells to `NULL`. The import flow now: - keeps all imported columns selected by default for backwards-compatible behavior - lets users narrow that selection down to specific columns - keeps preview behavior aligned with the actual inserted data ## Additional context I manually verified the full create-table-from-CSV flow locally in Studio, including saving the imported data and confirming that only the selected columns were persisted as `NULL` while other empty cells remained empty values. Formatting was checked with Prettier. A direct production build run was started locally, but the Next.js build process remained running without producing a final result during this session, so I am not claiming a completed local build verification here. ## Related issues - Fix follow-up for #43281 - Original issue: #43258 ## Summary by CodeRabbit ## Release Notes * **New Features** * Added a "Set empty cells as NULL" selector during spreadsheet import, allowing users to specify which columns should treat empty strings as NULL values rather than converting all nullable columns automatically. * Enhanced import preview to display NULL representation for selected empty-string columns. * **Tests** * Added test coverage for selective empty-string-to-NULL conversion behavior. --------- Co-authored-by: Charis Lam <26616127+charislam@users.noreply.github.com>