The enforce daemon loaded state once at startup and never reloaded it.
When the CLI reassigned a game (e.g. via 'done'), the daemon kept
enforcing the old assignment and deleted the newly assigned game every
3 seconds as 'unauthorized'.
Fix: reload state from disk at the top of each enforce loop iteration
so CLI changes take effect within one cycle.
Also add steam://install protocol handler for interactive installs
(via xdg-open) so Steam determines the correct installdir from its
own metadata, avoiding 'Missing game executable' errors from guessed
directory names in fabricated appmanifests.
