Copies Papirus-Dark mimetype icons into WallpaperAdwaita for
distinctive file type icons (json, python, markdown, etc.)
while keeping the wallpaper-colored folder icons from Adwaita.
Also fixes recolor script to process all place icons, not just
folders (fixes Desktop icon), and improves color mapping.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
