add ProxyJump function

internal/ui/app.go

@@ -116,6 +116,7 @@ type Model struct {
 	userNewGroupsOrder   []string
 	userNewCursor        int
 	userGroupsEditTarget string // non-empty: editing this existing user's groups instead of creating a new user
+	userNewProxyJump     bool   // ProxyJump vs LocalForward client config mode, toggled alongside groups on the same screen
 
 	// catalog: hosts and their services, shared across groups
 	catalogHostsList      list.Model