Add singular alias for auth connections subcommand

Add 'connection' as an alias for the 'connections' subcommand under
'auth', matching the pattern used by all other resource commands in
the CLI (browsers/browser, profiles/profile, proxies/proxy, etc.).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sjmiller609

cmd/auth_connections.go

@@ -711,9 +711,10 @@ func (c AuthConnectionCmd) Follow(ctx context.Context, in AuthConnectionFollowIn
 // --- Cobra wiring ---
 
 var authConnectionsCmd = &cobra.Command{
-	Use:   "connections",
-	Short: "Manage auth connections (managed auth)",
-	Long:  "Commands for managing authentication connections that keep profiles logged into domains",
+	Use:     "connections",
+	Aliases: []string{"connection"},
+	Short:   "Manage auth connections (managed auth)",
+	Long:    "Commands for managing authentication connections that keep profiles logged into domains",
 }
 
 var authConnectionsCreateCmd = &cobra.Command{