cmd/tailscale: support clickable IPv6 web client addresses

Instead of constructing the `ip:port` string ourselves, use
netip.AddrPortFrom which handles IPv6 correctly.

Updates tailscale#11164

Signed-off-by: Will Norris <will@tailscale.com>

cmd/tailscale/cli/web.go

@@ -99,7 +99,7 @@ func runWeb(ctx context.Context, args []string) error {
 	var startedManagementClient bool // we started the management client
 	if !existingWebClient && !webArgs.readonly {
 		// Also start full client in tailscaled.
-		log.Printf("starting tailscaled web client at http://%s:%d\n", selfIP.String(), web.ListenPort)
+		log.Printf("starting tailscaled web client at http://%s\n", netip.AddrPortFrom(selfIP, web.ListenPort))
 		if err := setRunWebClient(ctx, true); err != nil {
 			return fmt.Errorf("starting web client in tailscaled: %w", err)
 		}