Dashboard Container: Embed and Swap Panels

Problem/Feature Description

Your team is building the main dashboard screen for an iOS analytics app. The dashboard needs to show two panels side by side: a statistics summary on the left and a visualization on the right. Both panels are full view controllers managed by a central DashboardViewController. The design team has confirmed that the right panel must be swappable at runtime — users can switch between a chart view and a map view depending on which data dimension they select.

Everything must be built programmatically using UIKit, without storyboards or XIBs. The app targets iOS 15+. The dashboard will be used as the root content of a UINavigationController, so the view hierarchy must be robust and memory-safe.

Output Specification

Write a single Swift file named DashboardViewController.swift that contains:

• DashboardViewController — the container, with:
  • A StatsViewController embedded on the left half of the view
  • A ChartViewController embedded on the right half of the view, initially
  • A method replaceRightPanel(with:) that removes the current right panel and installs a new child view controller in its place
  • All layout done with Auto Layout constraints
• Stub implementations of StatsViewController, ChartViewController, and any additional child VC class you use in your demo of replaceRightPanel(with:)

The file should be complete and syntactically valid Swift. Include a brief comment at the top with your name and the date.