[w3c/screen-orientation] Square (1:1) screens fall outside both screen orientation values lists (Issue #279)

marcoscaceres created an issue (w3c/screen-orientation#279)

`Landscape` is defined as width _greater than_ height and `Portrait` as height _greater than_ width, both strict. A screen with a 1:1 aspect ratio therefore matches neither, so it cannot be assigned to either of the "screen orientation values lists" and its type-to-angle mapping is left undefined.

Implementations already diverge: Gecko maps a square screen to `landscape-primary` (`Screen::GetDefaultOrientationType` uses `Width() >= Height()`, `widget/Screen.cpp`), while WebKit's natural orientation is a per-device-class constant that ignores dimensions entirely (`naturalScreenOrientationType`, `Source/WebCore/page/ScreenOrientationType.h`). So a square screen is `landscape-primary` in Gecko but device-dependent in WebKit.

Should the spec define a tie-breaker for equal dimensions (e.g. square implies landscape, matching Gecko's `>=`)?


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