ffi: resolve foreign-class member types through Self substitution (issue-0043)

`inferExprType` for a chained call `Cls.static().instance(...)` never
looked the inner call's foreign-class declaration up, so the outer
dispatch saw a `.s64` receiver, the `foreign_class_map.get(...)` lookup
missed, and lowering emitted `error: unresolved 'method'`. The macOS
target appeared to work because `inline if OS == .ios { ... }` strips
the gated body before lowering — eliding every call that would have
exercised the broken path.

The "lazy-lower" framing in the original issue file was a red herring.

Fix in `src/ir/lower.zig`:

1. `inferExprType` for `.call` with `.field_access` callee now checks
   `foreign_class_map` for both shapes — `Cls.static_method(args)` (object
   identifier matches a foreign-class alias, look up static members) and
   `inst.instance_method(args)` (receiver is a pointer to a foreign-class
   struct, look up non-static members).
2. New helpers `resolveForeignMethodReturnType` and
   `resolveForeignClassMemberType` substitute `*Self` / `Self` to the
   foreign-class struct so a `*Self` return doesn't synthesize a phantom
   `Self`-named struct that future dispatches can't resolve.
3. The Obj-C lowering paths (`lowerObjcMethodCall`, `lowerObjcStaticCall`)
   route through the same helper for `ret_ty` so the IR Ref's type matches
   what `inferExprType` reports.

Regression test at `examples/138-foreign-class-chained-dispatch.sx`
exercises NSObject's `+alloc` / `-init` chain in both shapes —
`*NSObject` return then `*Self` return, and `*Self` then `*Self`. Runs
on the host (macOS) for live exercise; non-macOS hosts fall through to
a stub matching the expected output.

This unblocks Phase 3.2 C4/C5 — the `UIWindow.alloc().initWithWindowScene(scene)`
pattern that surfaced the bug is the cluster's bread-and-butter shape.

167/167 example tests; chess builds clean on macOS, iOS-sim, Android.

examples/138-foreign-class-chained-dispatch.sx

@@ -0,0 +1,41 @@
+// Chained foreign-class method dispatch: `Cls.static().instance(...)`
+// resolves the inner call's return type so the outer dispatch's
+// receiver type is known. Pre-fix this collapsed to s64 in
+// `inferExprType`, the foreign_class_map lookup missed, and lowering
+// emitted `error: unresolved 'init'` (or 'initWithWindowScene' etc.)
+// — see issues/0043 for the chess uikit.sx C4 migration that hit it.
+//
+// Two return-type shapes covered: explicit `*ClassName` (alloc here)
+// and `*Self` (init). Both must propagate through the chain so the
+// next `.method(...)` finds the foreign-class declaration.
+
+#import "modules/std.sx";
+#import "modules/compiler.sx";
+
+NSObject :: #foreign #objc_class("NSObject") {
+    alloc :: () -> *NSObject;
+    init :: (self: *Self) -> *Self;
+}
+
+NSObjectSelfReturn :: #foreign #objc_class("NSObject") {
+    alloc :: () -> *Self;
+    init :: (self: *Self) -> *Self;
+}
+
+main :: () -> s32 {
+    inline if OS == .macos {
+        a := NSObject.alloc().init();
+        if a != null {
+            print("explicit-then-self ok\n");
+        }
+        b := NSObjectSelfReturn.alloc().init();
+        if b != null {
+            print("self-then-self ok\n");
+        }
+    }
+    inline if OS != .macos {
+        print("explicit-then-self ok\n");
+        print("self-then-self ok\n");
+    }
+    0;
+}