agra f75923af00 uikit: type UIKitPlatform fields properly + handle optional in Obj-C encoding ...

The UIKitPlatform struct had a string of '*void = null; // UIWindow*'
fields — the type lived in a comment, every callsite had to 'xx'-cast
back to the real type. Migrated to the real foreign-class pointer
types now that M3 declared all the relevant '#objc_class' aliases:

  window:       ?*UIWindow
  root_vc:      ?*UIViewController
  gl_view:      ?*UIView         (SxGLView OR SxMetalView — both extend UIView)
  gl_layer:     ?*CALayer        (CAEAGLLayer OR CAMetalLayer)
  gl_ctx:       ?*EAGLContext
  display_link: ?*CADisplayLink

Each field is wrapped in '?' since the platform may not have set
it yet (gl_ctx is null in metal mode, display_link is null before
the first frame, etc.).

SxSceneDelegate's window getter/setter now take/return '?*UIWindow'
instead of '*void' so calling code doesn't need an xx-cast.

Required fix in objcTypeEncodingFromSignature: '?T' (optional) was
bailing with 'type kind not yet supported'. Apple's runtime treats
nullability as 'pointer may be null' — the wire encoding is the
same as T. Recursive unwrap handles ?*UIView → '@', ?*CADisplayLink
→ '@', etc.

Chess on iOS-sim: board renders, full pipeline intact. 183 tests
+ zig build test green.

2026-05-26 07:51:12 +03:00

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