Butlerd stores credentials in its SQLite DB after the first password
login. On restart, Profile.List finds saved profiles and
Profile.UseSavedLogin refreshes them — no cookie persistence needed on
our side.
The new 'Only show games available on this platform' checkbox in the
plugin settings drops games whose platforms don't include the OS
OpenGamepadUI is running on (e.g. Windows-only games on Linux). Games
with no platform info at all (HTML5) are kept since there's nothing to
filter on. The setting is read on every library load, so toggling it
reloads the itch.io library without a restart.
