Use accent color for title length hint #119
Description
Instead of red
- https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/property.StyleManager.system-supports-accent-colors.html
- https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/method.StyleManager.get_accent_color_rgba.html
- https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/property.StyleManager.accent-color.html
