Modernization & Discovery Overhaul (v7.0.42 - .NET 8 WPF)

[DarksAces]

📌 Overview

This Pull Request bumps the Steam Achievement Manager (SAM) to v7.0.42, bringing a massive modernization effort by transitioning the Picker from legacy WinForms to a modern, high-fidelity WPF interface. Alongside the UI revamp, it completely fixes critical issues with game discovery that occurred due to deprecated Steam API endpoints, restoring the classic SAM exact library detection.

✨ Key Features & UI Changes

• WPF Interface Rewrite: Replaced the outdated WinForms GamePicker.cs window with a fully responsive, dark-themed MainWindow.xaml WPF interface.
• Real-time Search Filter: Introduced a responsive text-based search/filter bar exactly at the top of the grid to allow users to quickly find massive libraries instantaneously.
• .NET 8 Upgrade: Cleaned up the .csproj file to utilize .NET 8, taking advantage of better runtime performance while strictly maintaining x86 output (essential for steamclient.dll interop).
• Version Update: Correctly reflects the new target version natively in the application window as v7.0.42.

🐛 Bug Fixes & Engine Restorations

• Restored Full Library Discovery:
  The official ISteamApps/GetAppList web endpoints are heavily rate-limited and deprecated.
  Re-implemented the battle-tested, classic Gibbed discovery engine: This application now properly downloads the master games.xml list again and directly queries the local client API using SteamApps008.IsSubscribedApp(...). This restores 100% discovery precision and eliminates generic "App 1000" fallbacks.
• Fixed Missing Image Capsules:
  Images reliant on generic static store CDN locations (capsule_184x69.jpg) failed frequently because retired/delisted games return HTTP 404s. Reverted the image resolver to safely request cached metadata properties (small_capsule, logo) from the local client API (SteamApps001). Now, all graphics load gracefully and asynchronously.
• Process Start Pathing Fixed:
  Resolved an issue where users clicking on a game from SAM.Picker.exe encountered an error because it couldn't locate SAM.Game.exe in local debug/dev environments. The startup info now traverses the solution properly to gracefully link with the \bin\ execution directory.

🛠️ Technical Details

• Added GameInfoViewModel.cs for clean XAML databinding (INotifyPropertyChanged).
• Added global DispatcherUnhandledException handlers to capture and diagnose rendering/API execution exceptions silently rather than crash-to-desktop.
• Maintained compatibility with steam_api.dll and original Gibbed API hooks.

[lieberung]

Great job!