iOS: Duo split engages when flat (include inactive hinge), size fallback; 1.0 RC 4

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ios/project.yml

@@ -8,8 +8,8 @@ settings:
     SWIFT_VERSION: "5.0"
     # iOS needs a plain number for the bundle version; the label is what the app and releases show.
     MARKETING_VERSION: "1.0"
-    VERSION_LABEL: "1.0 RC 3"
-    CURRENT_PROJECT_VERSION: "23"
+    VERSION_LABEL: "1.0 RC 4"
+    CURRENT_PROJECT_VERSION: "24"
 targets:
   Stemify:
     type: application