Add an option to export CSV directly in UTF-8 encoding

Currently, Apsona CSV exports default to system/browser encoding, which often causes accented characters (ñ, é, á, etc.) to appear mis-encoded. Users must re-import the file into Excel or Google Sheets and re-save it as UTF-8 before the data can be shared with external vendors.

This adds unnecessary manual steps, creates opportunities for error, and slows down recurring workflows such as housefile pulls and direct mail vendor exports.

Allowing users to select CSV UTF-8 as an export format would ensure that special characters are preserved correctly, eliminate re-encoding workarounds, and make Apsona exports immediately vendor-ready.