Frame sizes do not match expected behavior.

[Joannis]

Describe the bug
Defining a full width or -height view does not match expectations, unless you set the minWidth or minHeight explicitly to 0.

To Reproduce
The following code fails

WindowGroup("Tokamak App") {
    Color.black.frame(
        maxWidth: .infinity,
        maxHeight: .infinity
    )
}

Expected behavior
The entire view is black.

Screenshots
The view is only black in a strip in the center.

Desktop:

• OS: macOS
• Browser Safari
• Version of the browser 14.0.3 (16610.4.3.1.4)
• Version of Tokamak 0.6.1

Additional context
It's simply fixed by modifying the fillWidth and fillHeight checks from minWidth == 0 to minWidth ?? 0 == 0. I'd also suggest a similar change be made when no frame is set, to implicitly make the view infinite width/height, unless there's an exception such as Text or TextField which are bound by font size.