feat(Graphics): add `Size` type

```fsharp
type Size =
{
Width: int
Height: int
}
static member (*) ((this: Size), (scale: float)) =
let apply (side: int) =
int (float side * scale)
{
Width = apply this.Width
Height = apply this.Height
}
static member (*) ((scale: float), (this: Size)) =
this * scale

[]
[]
module Size =
let create w h = {
Width = w
Height = h
}
```

The issue provides the complete F# Size definition but names no file or test. First locate the Graphics area and related types in the repository, then run the project’s existing build or test command. Done means the Size type, module, and scaling operators compile and fit the library’s conventions.

Written by the indexing model from the issue text.