all: apply golangci-lint 2.9.0 fixes

Fix issues found by the upgraded golangci-lint:
- wsl_v5: add required whitespace in CLI files
- staticcheck SA4006: replace new(var.Field) with &localVar
  pattern since staticcheck does not recognize Go 1.26
  new(value) as a use of the variable
- staticcheck SA5011: use t.Fatal instead of t.Error for
  nil guard checks so execution stops
- unused: remove dead ptrTo helper function

hscontrol/db/node.go

@@ -682,6 +682,7 @@ func (hsdb *HSDatabase) CreateNodeForTest(user *types.User, hostname ...string)
 		panic(fmt.Sprintf("failed to create preauth key for test node: %v", err))
 	}
 
+	pakID := pak.ID
 	nodeKey := key.NewNode()
 	machineKey := key.NewMachine()
 	discoKey := key.NewDisco()
@@ -693,7 +694,7 @@ func (hsdb *HSDatabase) CreateNodeForTest(user *types.User, hostname ...string)
 		Hostname:       nodeName,
 		UserID:         &user.ID,
 		RegisterMethod: util.RegisterMethodAuthKey,
-		AuthKeyID:      new(pak.ID),
+		AuthKeyID:      &pakID,
 	}
 
 	err = hsdb.DB.Save(node).Error