Two bugs made the toggle look broken even though the preference was
stored correctly (JakeBreathild had online_hot_default false):
- The Account card never seeded online_hot_default into its form state,
so the checkbox always rendered checked via the '?? true' fallback.
It now starts from the saved value.
- Turning the toggle off did not change Online when the URL still
carried tags=order:hot (e.g. Ctrl+Shift+R reloading the old URL).
order:hot on its own is the default, not a deliberate search, so it is
now removed when the account has the toggle off; 'order:hot canine' or
any other search is still left untouched. The decision moved into
hotDefault.ts (set-hot / clear-hot / keep) with the matrix verified in
Node.
