VectorCraft found fonts only in the system's font folders (and, on Windows,
those font services activate). A new preference names one more folder, read
with its subfolders after the platform's: its fonts are listed in the font
menus and used as if installed, without installing them.
- vectorcraft_text::set_user_font_dirs / user_font_dirs: folders
system_font_dirs adds to every scan (none on wasm).
- prefs fontsFolder (Type > Options > Additional Fonts Folder), trimmed; when
it changes after the first scan, the fonts are scanned again at once, so the
folder's fonts appear (or go) and type in them lays out again.
- The label is translated where Additional Plug-ins Folder is.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>