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When services.syncthing.guiAddress is a unix socket, curlAddressArgs built `--unix-socket <sock> http://.<path>`. curl >= 8.21 tightened URL parsing and rejects the bare-dot authority with "URL rejected: Bad hostname" (exit 3), so every REST call in the merge script fails. Combined with `--retry 1000 --retry-delay 1 --retry-all-errors`, syncthing-init.service retries until systemd terminates it at the start timeout and Home Manager activation fails. Use `localhost` as the placeholder authority; --unix-socket still routes the request to the socket, and localhost is accepted by all curl versions. Add a regression test asserting the unix-socket path uses http://localhost.