dynamic marker not visible on bar chart

* [x] I've read, understood, and done my best to follow the [*CONTRIBUTING guidelines](https://github.com/jjatie/Charts/blob/master/CONTRIBUTING.md).

## What did you do?

i am trying to make custom markers where i am using markerview and adding my custom dynamic views, but when i am clicking the bars it is highlighting but not showing my any markers at the top. nothing is visible. I have debugged it is going in refreshContent delegate but it is not showing any view.

## What did you expect to happen?

i want my custom marker to be visible on click of bars

## What happened instead?

bars are highlighted but it is not showing any markers

## DGCharts Environment

**DGCharts version/Branch/Commit Number:** 5.1.0
**Xcode version:** 16
**Swift version:** 5
**Platform(s) running DGCharts:** ios
**macOS version running Xcode:**

## Demo Project

```

class CommonMarker: MarkerView{

private var customContentView: (UIView & MarkerUpdate)=MarkerUI(frame: CGRect(x: 0, y: 0, width: 100, height: 50))
private var markerFormat:MarkerFormat = .STEPS
private var lineColor: UIColor?
private let lineWidth: CGFloat = 2.0

func setup(format:MarkerFormat,lineColor:UIColor = UIColor(red: 0.9, green: 0.2, blue: 0.2, alpha: 1.0)){
self.lineColor = lineColor
self.markerFormat = format
self.customContentView.setupView(format: format)

setupView()
}

private func setupView(){

//customContentView.removeFromSuperview()

//customContentView = view
customContentView.translatesAutoresizingMaskIntoConstraints = false
addSubview(customContentView)

NSLayoutConstraint.activate([
customContentView.topAnchor.constraint(equalTo: topAnchor),
customContentView.leadingAnchor.constraint(equalTo: leadingAnchor),
customContentView.trailingAnchor.constraint(equalTo: trailingAnchor),
customContentView.bottomAnchor.constraint(equalTo: bottomAnchor)
])
self.backgroundColor = .red


}

override init(frame: CGRect) {
super.init(frame: frame)
}

required init?(coder: NSCoder) {
super.init(coder: coder)
}

override func refreshContent(entry: ChartDataEntry, highlight: Highlight) {

customContentView.update(format: markerFormat, entry: entry, highlight: highlight)

super.refreshContent(entry: entry, highlight: highlight)

}

}

protocol MarkerUpdate{
func update(format:MarkerFormat, entry: ChartDataEntry, highlight: Highlight)
func setupView(format:MarkerFormat)
}

class MarkerUI: UIView{


var unit:UILabel = UILabel()
var value:UILabel = UILabel()

override init(frame: CGRect) {
super.init(frame: frame)
}

required init?(coder: NSCoder) {
super.init(coder: coder)
}

}

//constraints
extension MarkerUI{

private func stepView(){
unit.translatesAutoresizingMaskIntoConstraints = false
value.translatesAutoresizingMaskIntoConstraints = false

value.text = "1234"
unit.text = "steps"

let container = UIView()
container.addSubview(value)
container.addSubview(unit)

NSLayoutConstraint.activate([
unit.leadingAnchor.constraint(equalTo: container.leadingAnchor),
unit.topAnchor.constraint(equalTo: container.topAnchor),
value.leadingAnchor.constraint(equalTo: unit.trailingAnchor, constant: 5),
value.trailingAnchor.constraint(equalTo: container.trailingAnchor)
])

self.addSubview(container)

NSLayoutConstraint.activate([
container.centerYAnchor.constraint(equalTo: self.centerYAnchor),
container.centerXAnchor.constraint(equalTo: self.centerXAnchor)
])
}
}

//value updates
extension MarkerUI{

private func updateStepView(value:Int){
self.value.text = value.toString()
self.unit.text = "steps"
}

}

// update info
extension MarkerUI: MarkerUpdate{

func update(format: MarkerFormat, entry: DGCharts.ChartDataEntry, highlight: DGCharts.Highlight) {
switch format {
}

}

```

i am setting marker to to bar chart as

```
let marker = CommonMarker()
marker.setup(format: .mark)
marker.chartView = barChartView

barChartView.marker = marker
```