flutter_news_template: `flutter pub get` pulls incompatible deps → missing packages (e.g., formz)

### Steps to reproduce

### Versions

```text
Flutter 3.29.3 • channel stable • https://github.com/flutter/flutter.git
Framework • revision ea121f8859 • 2025‑04‑11 19:10:07 +0000
Engine • revision cf56914b32
Dart • 3.7.2 • DevTools • 2.42.3

mason_cli       0.1.2
mason           0.1.1
flutter_news_template 1.0.15 (brickhub registry)
```

### Steps to Reproduce
1. Create a new project from the News Toolkit brick  
```bash
   mason make flutter_news_template
````

2. Configure Firebase ([per the toolkit docs](https://flutter.github.io/news_toolkit/)).
3. Fetch dependencies

```bash
   flutter pub get
```

### Expected results

`flutter pub get` should succeed and toolkit dependencies should have compatible versions so that the project analyzes and builds without missing‑package errors.

### Actual results

`flutter pub get` succeeds, but the project will not analyze or build because many packages are missing / unresolved:

```
error: Target of URI doesn't exist: 'package:formz/formz.dart'. (uri_does_not_exist at [form_inputs] lib/form_inputs.dart:1)
error: Target of URI doesn't exist: 'package:formz/formz.dart'. (uri_does_not_exist at [form_inputs] lib/src/email.dart:1)
error: Classes can only extend other classes. (extends_non_class at [form_inputs] lib/src/email.dart:12)
error: The class 'Object' doesn't have a constructor named 'pure'. (undefined_constructor_in_initializer at [form_inputs] lib/src/email.dart:14)
error: The class 'Object' doesn't have a constructor named 'dirty'. (undefined_constructor_in_initializer at [form_inputs] lib/src/email.dart:17)
error: No associated positional super constructor parameter. (super_formal_parameter_without_associated_positional at [form_inputs] lib/src/email.dart:17)
error: Target of URI doesn't exist: 'package:test/test.dart'. (uri_does_not_exist at [form_inputs] test/email_test.dart:3)
error: The function 'group' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:7)
error: The function 'group' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:8)
error: The function 'test' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:9)
error: The getter 'value' isn't defined for the type 'Email'. (undefined_getter at [form_inputs] test/email_test.dart:11)
error: The function 'expect' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:11)
error: The getter 'isPure' isn't defined for the type 'Email'. (undefined_getter at [form_inputs] test/email_test.dart:12)
error: The function 'expect' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:12)
error: The function 'test' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:15)
error: The getter 'value' isn't defined for the type 'Email'. (undefined_getter at [form_inputs] test/email_test.dart:17)
error: The function 'expect' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:17)
error: The getter 'isPure' isn't defined for the type 'Email'. (undefined_getter at [form_inputs] test/email_test.dart:18)
error: The function 'expect' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:18)
error: The function 'group' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:22)
error: The function 'test' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:23)
error: The function 'expect' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:24)
error: The getter 'error' isn't defined for the type 'Email'. (undefined_getter at [form_inputs] test/email_test.dart:25)
error: The function 'test' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:30)
error: The function 'expect' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:31)
error: The getter 'error' isn't defined for the type 'Email'. (undefined_getter at [form_inputs] test/email_test.dart:32)
error: The function 'test' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:37)
error: The function 'expect' isn't defined. (undefined_function at [form_inputs] test/email_test.dart:38)
error: The getter 'error' isn't defined for the type 'Email'. (undefined_getter at [form_inputs] test/email_test.dart:39)
error: Undefined name 'isNull'. (undefined_identifier at [form_inputs] test/email_test.dart:40)
error: Target of URI doesn't exist: 'package:gallery/colors/colors.dart'. (uri_does_not_exist at [gallery] lib/main.dart:3)
error: Target of URI doesn't exist: 'package:gallery/spacing/spacing.dart'. (uri_does_not_exist at [gallery] lib/main.dart:4)
error: Target of URI doesn't exist: 'package:gallery/typography/typography.dart'. (uri_does_not_exist at [gallery] lib/main.dart:5)
error: Target of URI doesn't exist: 'package:gallery/widgets/widgets.dart'. (uri_does_not_exist at [gallery] lib/main.dart:6)
error: Undefined name 'ColorsPage'. (undefined_identifier at [gallery] lib/main.dart:33)
error: Undefined name 'TypographyPage'. (undefined_identifier at [gallery] lib/main.dart:39)
error: Undefined name 'SpacingPage'. (undefined_identifier at [gallery] lib/main.dart:45)
error: Undefined name 'WidgetsPage'. (undefined_identifier at [gallery] lib/main.dart:51)
error: Target of URI doesn't exist: 'package:gallery/widgets/widgets.dart'. (uri_does_not_exist at [gallery] lib/widgets/widgets_page.dart:2)
error: Undefined name 'AppLogoPage'. (undefined_identifier at [gallery] lib/widgets/widgets_page.dart:17)
error: Undefined name 'AppButtonPage'. (undefined_identifier at [gallery] lib/widgets/widgets_page.dart:22)
error: Undefined name 'ShowAppModalPage'. (undefined_identifier at [gallery] lib/widgets/widgets_page.dart:27)
error: Undefined name 'AppTextFieldPage'. (undefined_identifier at [gallery] lib/widgets/widgets_page.dart:32)
error: Undefined name 'AppBackButtonPage'. (undefined_identifier at [gallery] lib/widgets/widgets_page.dart:38)
error: Undefined name 'AppSwitchPage'. (undefined_identifier at [gallery] lib/widgets/widgets_page.dart:43)
error: Target of URI doesn't exist: 'package:sqflite_common_ffi/sqflite_ffi.dart'. (uri_does_not_exist at [news_blocks_ui] test/src/post_medium/post_medium_test.dart:8)
error: The function 'sqfliteFfiInit' isn't defined. (undefined_function at [news_blocks_ui] test/src/post_medium/post_medium_test.dart:15)
error: Undefined name 'databaseFactory'. (undefined_identifier at [news_blocks_ui] test/src/post_medium/post_medium_test.dart:17)
error: Undefined name 'databaseFactoryFfi'. (undefined_identifier at [news_blocks_ui] test/src/post_medium/post_medium_test.dart:17)
error: Target of URI doesn't exist: 'package:sqflite_common_ffi/sqflite_ffi.dart'. (uri_does_not_exist at [news_blocks_ui] test/src/post_small_test.dart:8)
error: The function 'sqfliteFfiInit' isn't defined. (undefined_function at [news_blocks_ui] test/src/post_small_test.dart:16)
error: Undefined name 'databaseFactory'. (undefined_identifier at [news_blocks_ui] test/src/post_small_test.dart:18)
error: Undefined name 'databaseFactoryFfi'. (undefined_identifier at [news_blocks_ui] test/src/post_small_test.dart:18)
error: Target of URI doesn't exist: 'package:sqflite_common_ffi/sqflite_ffi.dart'. (uri_does_not_exist at [news_blocks_ui] test/src/trending_story_test.dart:7)
error: The function 'sqfliteFfiInit' isn't defined. (undefined_function at [news_blocks_ui] test/src/trending_story_test.dart:15)
error: Undefined name 'databaseFactory'. (undefined_identifier at [news_blocks_ui] test/src/trending_story_test.dart:17)
error: Undefined name 'databaseFactoryFfi'. (undefined_identifier at [news_blocks_ui] test/src/trending_story_test.dart:17)
error: Target of URI doesn't exist: 'package:onesignal_flutter/onesignal_flutter.dart'. (uri_does_not_exist at [one_signal_notifications_client] lib/src/one_signal_notifications_client.dart:2)
error: Undefined class 'OneSignal'. (undefined_class at [one_signal_notifications_client] lib/src/one_signal_notifications_client.dart:10)
error: Undefined class 'OneSignal'. (undefined_class at [one_signal_notifications_client] lib/src/one_signal_notifications_client.dart:14)
error: Target of URI doesn't exist: 'package:one_signal_notifications_client/one_signal_notifications_client.dart'. (uri_does_not_exist at [one_signal_notifications_client] test/src/one_signal_notifications_client_test.dart:5)
error: Target of URI doesn't exist: 'package:onesignal_flutter/onesignal_flutter.dart'. (uri_does_not_exist at [one_signal_notifications_client] test/src/one_signal_notifications_client_test.dart:6)
error: Classes and mixins can only implement other classes and mixins. (implements_non_class at [one_signal_notifications_client] test/src/one_signal_notifications_client_test.dart:8)
error: Undefined class 'OneSignal'. (undefined_class at [one_signal_notifications_client] test/src/one_signal_notifications_client_test.dart:12)
error: Undefined class 'OneSignalNotificationsClient'. (undefined_class at [one_signal_notifications_client] test/src/one_signal_notifications_client_test.dart:13)
error: The function 'OneSignalNotificationsClient' isn't defined. (undefined_function at [one_signal_notifications_client] test/src/one_signal_notifications_client_test.dart:19)
error: Target of URI doesn't exist: 'package:secure_storage/secure_storage.dart'. (uri_does_not_exist at [secure_storage] test/secure_storage_test.dart:4)
error: Undefined class 'SecureStorage'. (undefined_class at [secure_storage] test/secure_storage_test.dart:16)
error: The function 'SecureStorage' isn't defined. (undefined_function at [secure_storage] test/secure_storage_test.dart:20)
error: The name 'SecureStorage' isn't a class. (creation_with_non_type at [secure_storage] test/secure_storage_test.dart:25)
```

### Code sample

<details open><summary>Code sample</summary>

```dart
The code is the same code that is auto generated from `mason make flutter_news_template` 
```

</details>


### Screenshots or Video



<details open>
<summary>Screenshots</summary>
Android Studio showing that some dependencies for the packages did not resolve. 

![Image](https://github.com/user-attachments/assets/d8d981b5-febd-4bb1-aa05-9cc4660d07dc)


</details>


### Logs

<details open><summary>`flutter pub get` Logs</summary>

```console
flutter pub get
Synthetic package output (package:flutter_gen) is deprecated: https://flutter.dev/to/flutter-gen-deprecation. In a future release, synthetic-package will default to `false` and will later be removed entirely.
Resolving dependencies... (3.0s)
Downloading packages... (3.2s)
> _fe_analyzer_shared 76.0.0 (was 61.0.0) (82.0.0 available)
  _flutterfire_internals 1.3.42 (1.3.54 available)
+ _macros 0.3.3 from sdk dart
> analyzer 6.11.0 (was 5.13.0) (7.4.5 available)
  android_intent_plus 5.0.1 (5.3.0 available)
  args 2.4.2 (2.7.0 available)
> async 2.12.0 (was 2.11.0) (2.13.0 available)
  bloc 8.1.2 (9.0.0 available)
  bloc_concurrency 0.2.2 (0.3.0 available)
  bloc_test 9.1.4 (10.0.0 available)
> boolean_selector 2.1.2 (was 2.1.1)
  build 2.4.1 (2.4.2 available)
  build_config 1.1.1 (1.1.2 available)
  build_daemon 4.0.0 (4.0.4 available)
  build_resolvers 2.4.1 (2.4.4 available)
  build_runner 2.4.6 (2.4.15 available)
  build_runner_core 7.2.11 (8.0.0 available)
  built_value 8.6.3 (8.9.5 available)
  cached_network_image 3.3.1 (3.4.1 available)
  cached_network_image_platform_interface 4.0.0 (4.1.1 available)
  cached_network_image_web 1.2.0 (1.3.1 available)
> characters 1.4.0 (was 1.3.0)
> clock 1.1.2 (was 1.1.1)
  code_builder 4.7.0 (4.10.1 available)
> collection 1.19.1 (was 1.18.0)
  convert 3.1.1 (3.1.2 available)
  coverage 1.7.2 (1.13.1 available)
  crypto 3.0.3 (3.0.6 available)
  csslib 0.17.3 (1.0.2 available)
  dart_frog 1.1.0 (1.2.0 available)
  dart_style 2.3.2 (3.0.1 available)
> equatable 2.0.7 (was 2.0.5)
> fake_async 1.3.2 (was 1.3.1) (1.3.3 available)
  ffi 2.1.3 (2.1.4 available)
  file 7.0.0 (7.0.1 available)
  firebase_analytics 11.3.1 (11.4.5 available)
  firebase_analytics_platform_interface 4.2.3 (4.3.5 available)
  firebase_analytics_web 0.5.10 (0.5.10+11 available)
  firebase_auth 5.2.1 (5.5.3 available)
  firebase_auth_platform_interface 7.4.5 (7.6.2 available)
  firebase_auth_web 5.13.0 (5.14.2 available)
  firebase_core 3.4.1 (3.13.0 available)
  firebase_core_platform_interface 5.2.1 (5.4.0 available)
  firebase_core_web 2.18.0 (2.22.0 available)
  firebase_crashlytics 4.1.1 (4.3.5 available)
  firebase_crashlytics_platform_interface 3.6.42 (3.8.5 available)
  firebase_dynamic_links 6.0.6 (discontinued)
  firebase_dynamic_links_platform_interface 0.2.6+42 (0.2.7+5 available)
  firebase_messaging 15.1.1 (15.2.5 available)
  firebase_messaging_platform_interface 4.5.44 (4.6.5 available)
  firebase_messaging_web 3.9.0 (3.10.5 available)
  fixnum 1.1.0 (1.1.1 available)
  flow_builder 0.0.9 (0.1.0 available)
  flutter_bloc 8.1.3 (9.1.1 available)
  flutter_cache_manager 3.3.1 (3.4.1 available)
  flutter_facebook_auth 7.1.1 (7.1.2 available)
  flutter_html 3.0.0-beta.2 (3.0.0 available)
  flutter_secure_storage 9.2.2 (9.2.4 available)
  flutter_secure_storage_linux 1.2.1 (2.0.1 available)
  flutter_secure_storage_macos 3.1.2 (4.0.0 available)
  flutter_secure_storage_platform_interface 1.1.2 (2.0.1 available)
  flutter_secure_storage_web 1.2.1 (2.0.0 available)
  flutter_secure_storage_windows 3.1.2 (4.0.0 available)
  flutter_svg 2.0.7 (2.1.0 available)
  font_awesome_flutter 10.6.0 (10.8.0 available)
> formz 0.8.0 (was 0.7.0)
  frontend_server_client 3.2.0 (4.0.0 available)
  glob 2.1.2 (2.1.3 available)
  google_identity_services_web 0.2.2 (0.3.3+1 available)
  google_mobile_ads 5.0.0 (6.0.0 available)
  google_sign_in 6.2.1 (6.3.0 available)
  google_sign_in_android 6.1.20 (6.2.1 available)
  google_sign_in_ios 5.7.7 (5.9.0 available)
  google_sign_in_platform_interface 2.4.2 (2.5.0 available)
  google_sign_in_web 0.12.0+4 (0.12.4+4 available)
  graphs 2.3.1 (2.3.2 available)
  hotreloader 4.2.0 (4.3.0 available)
  html 0.15.4 (0.15.6 available)
  http 1.2.2 (1.4.0 available)
  http_multi_server 3.2.1 (3.2.2 available)
  http_parser 4.0.2 (4.1.2 available)
  hydrated_bloc 9.1.2 (10.0.0 available)
  in_app_purchase 3.2.0 (3.2.1 available)
  in_app_purchase_android 0.3.4+1 (0.4.0+1 available)
  in_app_purchase_storekit 0.3.14 (0.3.22+1 available)
! intl 0.19.0 (overridden) (0.20.2 available)
  io 1.0.4 (1.0.5 available)
  js 0.6.7 (0.7.2 available)
  json_serializable 6.8.0 (6.9.5 available)
> leak_tracker 10.0.8 (was 10.0.5) (11.0.1 available)
> leak_tracker_flutter_testing 3.0.9 (was 3.0.5) (3.0.10 available)
  leak_tracker_testing 3.0.1 (3.0.2 available)
  logging 1.2.0 (1.3.0 available)
+ macros 0.1.3-main.0
> matcher 0.12.17 (was 0.12.16+1)
  material_color_utilities 0.11.1 (0.12.0 available)
> meta 1.16.0 (was 1.15.0)
  mime 1.0.4 (2.0.0 available)
  mockingjay 0.6.0 (1.0.0 available)
  mocktail_image_network 1.0.0 (1.2.0 available)
  octo_image 2.0.0 (2.1.0 available)
  package_config 2.1.0 (2.2.0 available)
> path 1.9.1 (was 1.9.0)
  path_parsing 1.0.1 (1.1.0 available)
  path_provider 2.1.4 (2.1.5 available)
  path_provider_android 2.2.0 (2.2.17 available)
  path_provider_foundation 2.4.0 (2.4.1 available)
  path_provider_platform_interface 2.1.1 (2.1.2 available)
  path_provider_windows 2.2.1 (2.3.0 available)
  permission_handler 11.0.1 (12.0.0+1 available)
  permission_handler_android 11.1.0 (13.0.1 available)
  permission_handler_apple 9.1.4 (9.4.7 available)
  permission_handler_platform_interface 3.12.0 (4.3.0 available)
  permission_handler_windows 0.1.3 (0.2.1 available)
  petitparser 5.4.0 (6.1.0 available)
  platform 3.1.3 (3.1.6 available)
  provider 6.0.5 (6.1.5 available)
  pub_semver 2.1.4 (2.2.0 available)
  pubspec_parse 1.2.3 (1.5.0 available)
  quiver 3.2.1 (3.2.2 available)
  rxdart 0.27.7 (0.28.0 available)
  share_plus 10.0.2 (11.0.0 available)
  share_plus_platform_interface 5.0.0 (6.0.0 available)
  shared_preferences 2.2.2 (2.5.3 available)
  shared_preferences_android 2.2.1 (2.4.10 available)
  shared_preferences_foundation 2.3.4 (2.5.4 available)
  shared_preferences_linux 2.3.2 (2.4.1 available)
  shared_preferences_platform_interface 2.3.1 (2.4.1 available)
  shared_preferences_web 2.2.1 (2.4.3 available)
  shared_preferences_windows 2.3.2 (2.4.1 available)
  shelf 1.4.1 (1.4.2 available)
  shelf_static 1.1.2 (1.1.3 available)
  shelf_web_socket 1.0.4 (3.0.0 available)
  sign_in_with_apple 6.1.0 (7.0.1 available)
  sign_in_with_apple_platform_interface 1.1.0 (2.0.0 available)
  sign_in_with_apple_web 2.1.0 (3.0.0 available)
< sky_engine 0.0.0 from sdk flutter (was 0.0.99 from sdk flutter)
  source_gen 1.4.0 (2.0.0 available)
  source_helper 1.3.4 (1.3.5 available)
  source_map_stack_trace 2.1.1 (2.1.2 available)
  source_maps 0.10.12 (0.10.13 available)
> source_span 1.10.1 (was 1.10.0)
  sqflite 2.3.0 (2.4.2 available)
  sqflite_common 2.5.3 (2.5.5 available)
> stack_trace 1.12.1 (was 1.11.1)
> stream_channel 2.1.4 (was 2.1.2)
  stream_transform 2.1.0 (2.1.1 available)
> string_scanner 1.4.1 (was 1.2.0)
  synchronized 3.1.0 (3.3.1 available)
> term_glyph 1.2.2 (was 1.2.1)
> test 1.25.15 (was 1.25.7)
> test_api 0.7.4 (was 0.7.2)
> test_core 0.6.8 (was 0.6.4)
  timing 1.0.1 (1.0.2 available)
  typed_data 1.3.2 (1.4.0 available)
  url_launcher 6.1.14 (6.3.1 available)
  url_launcher_android 6.1.0 (6.3.16 available)
  url_launcher_ios 6.1.5 (6.3.3 available)
  url_launcher_linux 3.2.0 (3.2.1 available)
  url_launcher_macos 3.0.7 (3.2.2 available)
  url_launcher_web 2.3.3 (2.4.1 available)
  url_launcher_windows 3.1.2 (3.1.4 available)
  uuid 4.1.0 (4.5.1 available)
  vector_graphics 1.1.9 (1.1.18 available)
  vector_graphics_codec 1.1.9 (1.1.13 available)
  vector_graphics_compiler 1.1.9 (1.1.16 available)
  vector_math 2.1.4 (2.1.5 available)
  very_good_analysis 6.0.0 (7.0.0 available)
  video_player 2.7.2 (2.9.5 available)
  video_player_android 2.4.10 (2.8.3 available)
  video_player_avfoundation 2.4.11 (2.7.1 available)
  video_player_platform_interface 6.2.1 (6.3.0 available)
  video_player_web 2.0.17 (2.3.5 available)
> vm_service 14.3.1 (was 14.2.5) (15.0.0 available)
  watcher 1.1.0 (1.1.1 available)
  web 1.0.0 (1.1.1 available)
  web_socket_channel 2.4.0 (3.0.3 available)
  webview_flutter 4.7.0 (4.11.0 available)
  webview_flutter_android 3.16.0 (4.4.2 available)
  webview_flutter_platform_interface 2.10.0 (2.11.0 available)
  webview_flutter_wkwebview 3.13.0 (3.20.0 available)
! win32 5.5.4 (overridden) (5.13.0 available)
  xdg_directories 1.0.3 (1.1.0 available)
  xml 6.3.0 (6.5.0 available)
  yaml 3.1.2 (3.1.3 available)
Changed 27 dependencies!
1 package is discontinued.
165 packages have newer versions incompatible with dependency constraints.
Try `flutter pub outdated` for more information.
```

</details>


### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.29.3, on macOS 15.4.1 24E263 darwin-arm64, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.1)
[✓] Xcode - develop for iOS and macOS (Xcode 16.3)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2024.3)
[✓] VS Code (version 1.99.3)
[✓] Connected device (4 available)
[✓] Network resources

• No issues found!
```

</details>


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flutter_news_template: `flutter pub get` pulls incompatible deps → missing packages (e.g., formz) #168644

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flutter_news_template: flutter pub get pulls incompatible deps → missing packages (e.g., formz) #168644

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flutter_news_template: `flutter pub get` pulls incompatible deps → missing packages (e.g., formz) #168644