Updated the versions of various packages across four projects. In `ReactiveExample.csproj`, the `ReactiveUI` package was updated. In `Terminal.Gui.csproj`, the `System.IO.Abstractions` and `System.Text.Json` packages were updated. In `UICatalog.csproj`, the `Microsoft.VisualStudio.Azure.Containers.Tools.Targets`, `SixLabors.ImageSharp`, and `CsvHelper` packages were updated. In `UnitTests.csproj`, the `ReportGenerator`, `TestableIO.System.IO.Abstractions.TestingHelpers`, `xunit`, `xunit.runner.visualstudio`, and `coverlet.collector` packages were updated.
Updated several classes to improve viewport and content size handling.
Added `SetFrame` method to `View` class in `ViewLayout.cs` and replaced direct `_frame` property setting.
Updated `OnLayoutStarted` and `OnLayoutComplete` methods to take `ContentSize` instead of `oldViewport`. Added `ViewportChanged` event and `OnViewportChanged` method to `View` class in `ViewContent.cs`.
Updated `DrawEventArgs` and `LayoutEventArgs` classes in `ViewEventArgs.cs` to include new and old viewport properties and removed `Rectangle` property.
Updated `OnDrawContentComplete` method in `ViewDrawing.cs` to take `DrawEventArgs` instead of `Rectangle`.
Updated `SetViewport` method in `ViewContent.cs` to trigger `OnViewportChanged` event.
Added check in `ListView.cs` for view initialization before setting `ContentSize` and `Viewport`.
Updated `FileDialog` class in `FileDialog.cs` to use `NewViewport.Width` instead of `e.Rectangle.Width`.
Updated `ViewEventArgs` class in `ViewEventArgs.cs` to include a `view` parameter in its constructor.
