Show accepted signup delivery without a second send step (#62)

frontend/packages/sxchnge_auth/test/backend_test.dart

@@ -89,35 +89,48 @@ void main() {
       expect(keys[0], keys[1]);
     },
   );
-  test('signup receipt avoids duplicate delivery and subsequent resend reaches API', () async {
-    final paths = <String>[];
-    final service = BackendAuthServices(
-      baseUri: Uri.parse('https://api.example/api/v1'),
-      clientId: 'web',
-      client: MockClient((request) async {
-        paths.add(request.url.path);
-        if (request.url.path.endsWith('/signup')) {
-          expect(jsonDecode(request.body)['password'], ' password preserved ');
-          return response({'userId': 'user'});
-        }
-        return response({'accepted': true});
-      }),
-    );
-    addTearDown(service.close);
-    final result = await service.signup(
-      const SignupRequest(
-        name: 'User',
-        email: 'USER@example.com',
-        password: ' password preserved ',
-        locale: 'en',
-      ),
-    );
-    expect(result.isSimulated, isFalse);
-    await service.send(email: 'user@example.com', locale: 'en');
-    expect(paths, ['/api/v1/accounts/signup']);
-    await service.send(email: 'user@example.com', locale: 'en');
-    expect(paths.last, '/api/v1/accounts/verification/send');
-  });
+  test(
+    'signup returns its receipt and every explicit resend reaches API',
+    () async {
+      final paths = <String>[];
+      final service = BackendAuthServices(
+        baseUri: Uri.parse('https://api.example/api/v1'),
+        clientId: 'web',
+        client: MockClient((request) async {
+          paths.add(request.url.path);
+          if (request.url.path.endsWith('/signup')) {
+            expect(
+              jsonDecode(request.body)['password'],
+              ' password preserved ',
+            );
+            return response({'userId': 'user'});
+          }
+          return response({'accepted': true});
+        }),
+      );
+      addTearDown(service.close);
+      final result = await service.signup(
+        const SignupRequest(
+          name: 'User',
+          email: 'USER@example.com',
+          password: ' password preserved ',
+          locale: 'en',
+        ),
+      );
+      expect(result.isSimulated, isFalse);
+      expect(result.delivery?.email, 'user@example.com');
+      expect(result.delivery?.isSimulated, isFalse);
+      expect(paths, ['/api/v1/accounts/signup']);
+      await service.send(email: 'user@example.com', locale: 'en');
+      expect(paths, [
+        '/api/v1/accounts/signup',
+        '/api/v1/accounts/verification/send',
+      ]);
+      await service.send(email: 'user@example.com', locale: 'en');
+      expect(paths.last, '/api/v1/accounts/verification/send');
+      expect(paths, hasLength(3));
+    },
+  );
   test('login confirms backend session only after factor and consumes local grant once', () async {
     final now = DateTime.now();
     var verified = false;