* feat(notifications): add system notifications toggle in settings
Add a per-user, per-workspace toggle to enable/disable native OS
notification banners. Reuses the existing notification-preferences
endpoint by introducing a `system_notifications` key alongside the
inbox event groups; the realtime handler reads the cached preference
and skips desktopAPI.showNotification when muted.
Co-authored-by: multica-agent <github@multica.ai>
* fix(notifications): fetch system_notifications pref lazily
Settings is the only mounted reader of notificationPreferenceOptions,
so a fresh app start (or any session that never visits Settings) left
the cache empty and the muted preference silently fell back to default
"all". Switch the inbox:new handler to ensureQueryData so the value is
fetched on first use and cached for subsequent events.
Co-authored-by: multica-agent <github@multica.ai>
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Co-authored-by: multica-agent <github@multica.ai>