Various admin extension improvements

[kirre-bylund]

🔧 Refactor Admin Extension for Improved Maintainability and User Experience

📋 Summary

This PR introduces a comprehensive refactoring of the LootLocker Admin Extension to improve code maintainability, user experience, and developer productivity. The changes break down a monolithic 1000+ line file into focused components while adding several new features and fixing existing issues. It is a big PR unfortunately. But I've tried breaking the changes up in atomic commits, so going commit by commit may make the review a bit easier.

✨ New Features

• NEW: Added dedicated settings interface accessible from the admin extension
• NEW: Proactive license countdown display for trial accounts with link to console
• Smart Environment Switcher: Automatically hidden for stage-only games (created after March 10, 2025)
• Filtered Display: Only shows game api keys
• Visual Feedback: Selected keys are clearly highlighted with colored borders

🏗️ Architecture Improvements

📁 Modular File Structure

Refactored the monolithic LootLockerAdminExtension.cs (1000+ lines) into focused partial classes:

• LootLockerAdminExtension.cs (299 lines) - Core flow management
• LootLockerAdminExtension.UI.cs (246 lines) - UI initialization & styling
• LootLockerAdminExtension.EventHandlers.cs (154 lines) - Event handling
• LootLockerAdminExtension.Authentication.cs (227 lines) - Login/logout logic
• LootLockerAdminExtension.GameManagement.cs (200 lines) - Game & API key management
• LootLockerAdminExtension.Settings.cs (100 lines) - Configuration management

🧹 Code Quality Improvements

• Consistent Patterns: Standardized callback patterns in LootLockerExtensionCalls.cs
• Better Error Handling: Centralized popup management and error messaging
• Resource Management: Proper cleanup and memory management
• Thread Safety: Improved admin request log level management with proper counting

🎯 Separation of Concerns

• Single Responsibility: Each partial class handles one specific area of functionality
• Loose Coupling: Reduced dependencies between UI components
• Testability: Focused classes are easier to unit test
• Maintainability: Bug fixes and features can be implemented in isolated areas

🐛 Bug Fixes

🔧 Log Level Management

• Fixed: Race conditions in admin request log level restoration
• Enhanced: Thread-safe counting system for concurrent admin requests
• Improved: Proper EditorPrefs persistence of config changes

🎨 UI/UX Improvements

• Fixed: Inconsistent environment switcher visibility
• Enhanced: Better loading state management with centralized methods
• Improved: Consistent styling and color management
• Security: Clear warning about EditorPrefs storage on login screen

🔄 Migration Notes

• No breaking changes: All existing functionality preserved
• Automatic migration: Settings automatically migrate to new immediate-save pattern
• EditorPrefs compatibility: All existing preferences continue to work
• API compatibility: No changes to public interfaces