fix: read back sent copies after the sec 5.6 upstream fix, pinned at 2d65d66

lib/native/library.dart

@@ -0,0 +1,13 @@
+// Opens the native library (lib/smol -> fumi-core) the app links against.
+// Android bundles the cdylib under its plain soname; Linux loads the built
+// artifact from the checkout in dev/test and the bundle dir in release.
+
+import "dart:ffi";
+import "dart:io";
+
+DynamicLibrary openSmolLibrary() {
+  if (Platform.isAndroid) {
+    return DynamicLibrary.open("libsmol_mail_native.so");
+  }
+  return DynamicLibrary.open("native/target/release/libsmol_mail_native.so");
+}