fix(ios): directory picker - add App Documents option for iOS

- iOS limitation: empty folders cannot be selected via document picker
- Added bottom sheet with App Documents Folder as recommended option
- Shows info message explaining iOS limitation
- Files accessible via iOS Files app

Version: 2.0.7-preview2+38

lib/constants/app_info.dart

@@ -1,7 +1,7 @@
 /// App version and info constants
 /// Update version here only - all other files will reference this
 class AppInfo {
-  static const String version = '2.0.7-preview';
+  static const String version = '2.0.7-preview2';
   static const String buildNumber = '37';
   static const String fullVersion = '$version+$buildNumber';