notify() now accepts an optional duration override; the SSH domain
save/update toasts use it to stay up 10s (vs the default 4s) and lead
with a bold warning that connecting immediately will fail and
wezterm-gui.exe needs a full restart (Task Manager End Task, not just
reload) before the new/edited domain is usable.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>