Font services load their fonts with GDI at run time, from files in their
own folders, without installing them: neither the font folders nor the
registry list them, so the font scan never saw them. DirectWrite's system
font collection holds them since Windows 10 1607.
- vectorcraft-text: `set_platform_font_files` lets the app name font files
the platform knows; each scan and each check for installed fonts asks
again and reads those outside the font folders. A file named by itself
is read whatever its extension (font services keep fonts in files
without one).
- The desktop app lists the local files of DirectWrite's system font
collection on Windows (`system_fonts.rs`, through the windows crate
already in the build), read in place.
- The check for fonts installed while the app was in the background runs
on a thread: DirectWrite's check for updates takes about 50 ms.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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