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Kenta IshizakiandGitHub c5fb8d73cc fix: Prepend UTF-8 BOM to contact CSV export for non-ASCII character support (#14123)
## Description

Spreadsheet applications such as Microsoft Excel do not auto-detect
UTF-8 encoding when opening CSV files. This causes non-ASCII characters
(Arabic, Japanese, Chinese, Korean, etc.) to appear garbled in the
exported contacts CSV.

This PR prepends the UTF-8 Byte Order Mark (`EF BB BF`) to the CSV
output in `Account::ContactsExportJob`, which signals to spreadsheet
applications that the file is UTF-8 encoded.

Fixes: #13998
2026-04-24 18:06:25 +05:30
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