fix(plugin-import-export): adds UTF-8 BOM support to csv exports #14044
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What?
Adds UTF-8 Byte Order Mark (BOM) to CSV exports in both streaming and buffered export paths.
Why?
CSV exports containing non-Latin scripts (e.g., Hebrew, Arabic, Chinese) display as mojibake in Microsoft Excel on Windows because Excel defaults to ANSI encoding and fails to auto-detect UTF-8 without a BOM.
The BOM (
EF BB BF) signals UTF-8 encoding to Excel without breaking compatibility with other tools (Google Sheets, LibreOffice, modern CSV parsers all handle it correctly).How?
0xEF 0xBB 0xBF) to the first chunk in streaming CSV exports\uFEFF) to buffered CSV exportscharset=utf-8for CSV filesFixes #13929