docs: the Swift rule covers extension members, not file-scope functions (#7904)

apps/ios/CLAUDE.md

@@ -2,11 +2,12 @@
 
 ## Swift code
 
-- Functions and computed properties are declared in the body of the type they belong to, never at file scope or in an extension of a type declared in this project.
-- A member of a SimpleXChat type is declared in that type when everything it uses is available in SimpleXChat. A member that depends on the app is a static member of the app type that uses it; when several app types use it, of the type that names its concept.
 - An extension is written only where Swift has no other form:
   - a SwiftUI environment value, which SwiftUI requires as a property of EnvironmentValues;
   - a conformance, required by an API, of a type declared in another module.
+- Members of a type declared in this project are declared in the body of that type, not in an extension.
+- A member of a SimpleXChat type is declared in that type; a value it needs from the app is passed as a parameter.
 - A view modifier is a ViewModifier type applied with `.modifier(_:)`.
 - A custom alignment is a static constant of a non-generic type that uses it.
-- A new member is declared in its type even when the file already extends that type. Existing extensions and file-scope functions are moved only in a task that concerns them.
+- Functions and constants at file scope are kept at file scope.
+- A new member is declared in its type even when the file already extends that type. Existing extensions are moved only in a task that concerns them.