fix(ui): ExportMenu CSV serializer does not quote fields containing newlines

[github-actions]

Summary

The CSV serializer in ExportMenu.tsx only quotes fields that contain commas, but does not handle values containing \n or \r. A single cell with embedded newlines will be emitted as multiple CSV rows, producing a malformed export file.

Affected file

src/UILayer/web/src/components/shared/ExportMenu.tsx — line 23

Required fix

const needsQuoting = (val: string) =>
  val.includes(',') || val.includes('"') || val.includes('\n') || val.includes('\r')

References

• PR Phase 16: Remaining widgets, role-based UI, frontend tests #361 review: Phase 16: Remaining widgets, role-based UI, frontend tests #361 (comment)
• Severity: 🟡 Minor

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