fix(docker): anchor hostname extraction to leading "Name:" only

`docker info` emits both `Username: <user>` (under `Server:`) and
`Name: <host>` near the bottom; the previous grep pattern `-i -e name:`
caught both, so on hosts where docker stores credentials we ended up with
`DOCKER_SERVER_NAME_HOST="<user> <host>"` after `cut + xargs` glued the
two matches together. The Darwin `case` dispatch downstream then failed
to recognise "Docker Desktop" / "Rancher Desktop", silently turning off
the loop-hack workarounds.

Anchor the grep to a leading-whitespace + literal `Name:` and take only
the first match (`-m1`). Pre-existing on main, surfaced during P2b review
by @coderabbitai.

Assisted-by: Claude:claude-opus-4.7

Author: iav

lib/functions/host/docker.sh

@@ -222,7 +222,7 @@ function docker_cli_prepare() {
 	fi
 	display_alert "Docker has buildx?" "${DOCKER_HAS_BUILDX}" "debug"
 
-	DOCKER_SERVER_NAME_HOST="$(grep -i -e "name:" <<< "${DOCKER_INFO}" | cut -d ":" -f 2 | xargs echo -n)"
+	DOCKER_SERVER_NAME_HOST="$(grep -im1 -e "^ *Name:" <<< "${DOCKER_INFO}" | cut -d ":" -f 2 | xargs echo -n)"
 	display_alert "Docker Server Hostname" "${DOCKER_SERVER_NAME_HOST}" "debug"
 
 	# Gymnastics: under Darwin, Docker Desktop and Rancher Desktop in dockerd mode behave differently.