When an Origin purchase is first detected via credential refresh (e.g.
linked from account.brave.com), open the Origin settings screen and show
the existing restart snackbar.
The shared first-purchase trigger in BraveOriginService::OnCredentialSummary
calls the navigation delegate, whose Android branch was previously a no-op.
It now routes through a JNI helper that opens BraveOriginPreferences with an
explicit show-restart flag, where onViewCreated shows the restart snackbar.
Play Store purchases are left to the existing Java subscription flow (which
shows the "Disabling features" spinner while credentials are fetched, then
transitions to the restart prompt). The helper skips opening when a Play
Store purchase token is present so the screen isn't opened twice.
Resolves: https://github.com/brave/brave-browser/issues/55991
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