fix(following): 收紧取消追剧确认弹窗

test/following/following_page_test.dart

@@ -143,6 +143,31 @@ void main() {
     await tester.tap(find.byKey(const Key('following-cancel-follow')));
     await tester.pumpAndSettle();
     expect(find.text('Unfollow the selected dramas?'), findsOneWidget);
+    final dialog = tester.widget<AlertDialog>(find.byType(AlertDialog));
+    expect(dialog.contentPadding, const EdgeInsets.all(20));
+    expect(dialog.actionsPadding, const EdgeInsets.fromLTRB(20, 0, 20, 20));
+    expect(
+      tester
+          .getSize(
+            find.descendant(
+              of: find.byType(AlertDialog),
+              matching: find.byType(TextButton),
+            ),
+          )
+          .height,
+      32,
+    );
+    expect(
+      tester
+          .getSize(
+            find.descendant(
+              of: find.byType(AlertDialog),
+              matching: find.byType(FilledButton),
+            ),
+          )
+          .height,
+      32,
+    );
     await tester.tap(
       find.descendant(
         of: find.byType(AlertDialog),