The Safari reader set `domain` on every cookie, but `ImportedCookie.domain`
is only for domain cookies (leading dot): Electron treats any supplied
`domain` as one and re-adds the dot, widening host-only cookies to every
subdomain and rejecting `__Host-` cookies outright. Route through the shared
`cookieScope` like the Chromium and Firefox readers do, which also owns the
IPv6 bracketing.

Co-Authored-By: Claude Code <noreply@anthropic.com>