phase3: nullfix.py batch script — bang/late/param-nullable

Automated null-safety fixes driven by dart analyze (no corruption):
- unchecked_use_of_nullable_value: insert '!' on receiver (property/method/[]/op)
- not_initialized field/var: mark 'late'
- missing_default_value_for_parameter: nullable param
Errors: 2374(peak) -> 907

lib/pages/igoshow_learn_more.dart

@@ -26,7 +26,7 @@ class IGoShowLearnMore extends StatefulWidget {
 
 class IGoShowLearnMoreState extends State<IGoShowLearnMore> {
   final _scaffoldKey = GlobalKey<ScaffoldState>();
-  Map<String, dynamic> data;
+  late Map<String, dynamic> data;
 
   @override
   Widget build(BuildContext context) {