Fix AI model extraction on Windows profiles with non-ASCII paths - #21654
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Fixes #21640
Users with accented characters in their Windows profile (e.g.
C:\Users\Joël\...) can't install AI models. Extraction fails withFailed to open 'C:\Users\Joël\...'– UTF-8 bytes reinterpreted as CP1252.libarchive's narrow-char APIs go through the ANSI code page on Windows, as does the
_fullpathwe were using via arealpathshim. Route all pathname handoffs through the wide-char variants (archive_read_open_filename_w,archive_entry_copy_pathname_w,_wfullpath) with UTF-8 ↔ UTF-16 conversion via glib. POSIX unchanged. Old shim removed – it had the same bug this fixes.