Issues found when analyzed the project's dart code

- 10 issues found when we analyze the project's dart code using `flutter analyze`
- Basically `flutter analyze`, Analyzes the project's Dart code.

### Issues Found
```
info • 'toggleableActiveColor' is deprecated and shouldn't be used. No longer used by the framework,
please remove any reference to it. For more information, consult the migration guide at
https://flutter.dev/docs/release/breaking-changes/toggleable-active-color#migration-guide.
This feature was deprecated after v3.4.0-19.0.pre • lib/theme/app_theme.dart:13:5 •
deprecated_member_use
info • 'toggleableActiveColor' is deprecated and shouldn't be used. No longer used by the framework,
please remove any reference to it. For more information, consult the migration guide at
https://flutter.dev/docs/release/breaking-changes/toggleable-active-color#migration-guide.
This feature was deprecated after v3.4.0-19.0.pre • lib/theme/app_theme.dart:26:5 •
deprecated_member_use
info • 'primary' is deprecated and shouldn't be used. Use backgroundColor instead. This feature was
deprecated after v3.1.0 • lib/ui/views/login/login_view.dart:159:31 • deprecated_member_use
info • 'subtitle1' is deprecated and shouldn't be used. Use titleMedium instead. This feature was
deprecated after v3.1.0-0.0.pre • lib/ui/widgets/dumb_widgets/document_type_card.dart:20:49 •
deprecated_member_use
info • 'primary' is deprecated and shouldn't be used. Use backgroundColor instead. This feature was
deprecated after v3.1.0 • lib/ui/widgets/dumb_widgets/password_change_dialog_widget.dart:49:27
• deprecated_member_use
info • 'primary' is deprecated and shouldn't be used. Use backgroundColor instead. This feature was
deprecated after v3.1.0 • lib/ui/widgets/dumb_widgets/torrent_label_dialog.dart:77:11 •
deprecated_member_use
error • The method 'FlatButton' isn't defined for the type '_FloatingBoxBottomSheet' •
lib/ui/widgets/smart_widgets/bottom_sheets/bottom_sheet_setup.dart:88:19 • undefined_method
error • The method 'FlatButton' isn't defined for the type 'ConfirmBottomSheetView' •
lib/ui/widgets/smart_widgets/bottom_sheets/confirm_bottom_sheet/confirm_bottom_sheet_view.dart:
53:15 • undefined_method
info • 'primary' is deprecated and shouldn't be used. Use backgroundColor instead. This feature was
deprecated after v3.1.0 •
lib/ui/widgets/smart_widgets/url_bottom_sheet/url_bottomsheet_view.dart:77:19 •
deprecated_member_use
info • 'primary' is deprecated and shouldn't be used. Use backgroundColor instead. This feature was
deprecated after v3.1.0 •
lib/ui/widgets/smart_widgets/url_bottom_sheet/url_bottomsheet_view.dart:110:25 •
deprecated_member_use

10 issues found. (ran in 2.2s)
```