Share the platform-neutral Rust mobile contract (#91)

crates/storage/tests/entry_documents.rs

@@ -183,7 +183,7 @@ fn complex_documents_round_trip_with_storage_owned_metadata() -> TestResult {
     assert_eq!(mobile_custom[1].value(), Some(""));
     let mobile_otp = mobile_fields
         .iter()
-        .find(|field| field.system_image() == "timer")
+        .find(|field| field.icon() == ironstorage::mobile::MobileIcon::Timer)
         .expect("OTP field");
     assert!(mobile_otp.sensitive());
     assert_eq!(mobile_otp.value(), None);
@@ -192,7 +192,7 @@ fn complex_documents_round_trip_with_storage_owned_metadata() -> TestResult {
     }));
     let mobile_note = mobile_fields
         .iter()
-        .find(|field| field.system_image() == "note.text")
+        .find(|field| field.icon() == ironstorage::mobile::MobileIcon::Note)
         .expect("multiline note");
     assert!(!mobile_note.sensitive());
     assert!(mobile_note.multiline());