Migrate Radio to RadioGroup widget

[dougborg]

Stack order: 3/5 — merge after PR2 (lint cleanup)

Summary

• Migrate Radio with groupValue/onChanged to RadioGroup widget per Flutter deprecation
• Fix type mismatch in language_section.dart RadioGroup

Test plan

• Verify radio buttons in settings screens still function correctly
• Run flutter analyze with zero warnings

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR migrates RadioListTile widgets to use the new RadioGroup wrapper widget, which is a Flutter 3.27+ Material 3 feature that simplifies radio button group management by eliminating the need to pass groupValue and onChanged to each individual radio button. The PR also includes extensive code modernization updates aligned with Flutter 3.27+ deprecations and best practices.

Changes:

• Migrated two radio button groups to use RadioGroup wrapper (in refine_tags_sheet.dart and language_section.dart)
• Updated opacity handling from deprecated withOpacity() to withValues(alpha:) throughout the codebase
• Replaced deprecated WillPopScope with PopScope API
• Modernized Material 3 color scheme usage (surfaceVariant → surfaceContainerHighest)
• Converted print statements to debugPrint for better Flutter integration
• General code cleanup: removed unused imports, variables, and functions; improved string interpolation; removed unnecessary .toList() calls

Reviewed changes

Copilot reviewed 80 out of 81 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
lib/widgets/refine_tags_sheet.dart	Migrated operator profile radio buttons to RadioGroup
lib/screens/settings/sections/language_section.dart	Migrated language selection radio buttons to RadioGroup
scripts/validate_localizations.dart	Bug: Incorrectly changed print to debugPrint in standalone Dart script
lib/widgets/*.dart (multiple)	Updated deprecated withOpacity() calls to withValues(alpha:)
lib/widgets/nuclear_reset_dialog.dart	Migrated WillPopScope to PopScope
lib/services/*.dart (multiple)	Converted print to debugPrint and code cleanup
lib/screens/*.dart (multiple)	Material 3 color updates and code cleanup
test/*.dart	Updated test imports and removed unused test file
pubspec.yaml, pubspec.lock	Added flutter_lints and collection dependencies

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[Copilot]

Pull request overview

Copilot reviewed 77 out of 79 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

lib/screens/settings/sections/language_section.dart:51

• _setLanguage awaits LocalizationService.instance.setLanguage(...) and then calls setState without checking mounted. If the widget is disposed during the await, this will throw. Add a if (!mounted) return; guard before setState.

  Future<void> _setLanguage(String? languageCode) async {
    await LocalizationService.instance.setLanguage(languageCode);
    setState(() {
      _selectedLanguage = languageCode;
    });
  }

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[stopflock]

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