cleanup

src/MarcerGameDvdLauncher/FavoritesService.cs

@@ -4,7 +4,7 @@
 namespace MarcerGameDvdLauncher
 {
     // Manages loading, saving and querying favorite ZIP paths.
-    public class FavoritesService
+    public class FavoritesService(string filePath)
     {
         // Virtual folder name displayed at the root when favorites exist.
         // Not configurable — fixed UI element.
@@ -14,15 +14,10 @@ namespace MarcerGameDvdLauncher
         // Not configurable — fixed persistence file.
         public const string DefaultFileName = "favorites.txt";
 
-        private readonly string _filePath;
+        private readonly string _filePath = filePath ?? throw new ArgumentNullException(nameof(filePath));
         // Use a SortedSet so favorites are kept in sorted order in memory.
         private SortedSet<string> _favorites = new(StringComparer.OrdinalIgnoreCase);
 
-        public FavoritesService(string filePath)
-        {
-            _filePath = filePath ?? throw new ArgumentNullException(nameof(filePath));
-        }
-
         // Load favorites from disk (no-op if file missing)
         public void Load()
         {
@@ -31,7 +26,7 @@ namespace MarcerGameDvdLauncher
             var lines = File.ReadAllLines(_filePath, System.Text.Encoding.UTF8);
             foreach (var l in lines)
             {
-                var t = l?.Trim();
+                var t = l.Trim();
                 if (string.IsNullOrEmpty(t)) continue;
                 try
                 {
@@ -71,14 +66,13 @@ namespace MarcerGameDvdLauncher
             if (string.IsNullOrWhiteSpace(path)) throw new ArgumentNullException(nameof(path));
             var full = Path.GetFullPath(path);
             bool added;
-            if (_favorites.Contains(full))
+            if (!_favorites.Add(full))
             {
                 _favorites.Remove(full);
                 added = false;
             }
             else
             {
-                _favorites.Add(full);
                 added = true;
             }
             Save();

src/MarcerGameDvdLauncher/HatariLauncher.cs

@@ -44,15 +44,8 @@ namespace MarcerGameDvdLauncher
                 throw new ArgumentException("ZIP archive path must not be empty.", nameof(zipFilePath));
             try
             {
-                string args = _argsTemplate;
-                if (!string.IsNullOrWhiteSpace(_cfgPath))
-                {
-                    args = args.Replace("{cfg}", _cfgPath);
-                }
-                else
-                {
-                    args = args.Replace("{cfg}", Path.Combine(Directory.GetCurrentDirectory(),DEFAULT_CONFIG_FILE));
-                }
+                var args = _argsTemplate;
+                args = args.Replace("{cfg}", !string.IsNullOrWhiteSpace(_cfgPath) ? _cfgPath : Path.Combine(Directory.GetCurrentDirectory(),DEFAULT_CONFIG_FILE));
                 args = args.Replace("{zip}", zipFilePath);
 
                 var psi = new System.Diagnostics.ProcessStartInfo

src/MarcerGameDvdLauncher/InputController.cs

@@ -1,11 +1,6 @@
 // Copyright (c) 2026 Stefan Koelle (https://stefankoelle.de)
 // Licensed under the MIT License. See LICENSE file in project root for details.
 
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Threading;
-
 namespace MarcerGameDvdLauncher
 {
     /// <summary>
@@ -13,42 +8,25 @@ namespace MarcerGameDvdLauncher
     /// Extracted from AppHost so that LauncherApp stays focused on lifecycle management.
     /// No functional change - all key-handling behaviour is preserved exactly.
     /// </summary>
-    internal class InputController
+    internal class InputController(
+        OverlayDirectoryBrowser directoryBrowser,
+        MenuRenderer menuRenderer,
+        NavigationController navigationController,
+        HatariLauncher hatariLauncher,
+        FavoritesService favoritesService,
+        UIErrorService errorService)
     {
-        private readonly OverlayDirectoryBrowser _directoryBrowser;
-        private readonly MenuRenderer _menuRenderer;
-        private readonly NavigationController _navigationController;
-        private readonly HatariLauncher _hatariLauncher;
-        private readonly FavoritesService _favoritesService;
-        private readonly UIErrorService _errorService;
-
         private List<GameEntry> _gameEntries = new();
 
-        public IReadOnlyList<GameEntry> GameEntries => _gameEntries;
-
-        public InputController(OverlayDirectoryBrowser directoryBrowser, MenuRenderer menuRenderer,
-            NavigationController navigationController, HatariLauncher hatariLauncher,
-            FavoritesService favoritesService, UIErrorService errorService)
-        {
-            _directoryBrowser = directoryBrowser;
-            _menuRenderer = menuRenderer;
-            _navigationController = navigationController;
-            _hatariLauncher = hatariLauncher;
-            _favoritesService = favoritesService;
-            _errorService = errorService;
-        }
-
         private bool IsFavorite(GameEntry e)
         {
-            return e.Kind == EntryKind.Zip
-                ? _favoritesService.IsFavorite(e.InPatch ? e.PatchPath : e.RootPath)
-                : false;
+            return e.Kind == EntryKind.Zip && favoritesService.IsFavorite(e.InPatch ? e.PatchPath : e.RootPath);
         }
 
         private void DrawMenu(int availableLines)
         {
-            _menuRenderer.DrawMenu(_gameEntries, _navigationController.ScrollOffset,
-                _navigationController.SelectedIndex, availableLines, IsFavorite);
+            menuRenderer.DrawMenu(_gameEntries, navigationController.ScrollOffset,
+                navigationController.SelectedIndex, availableLines, IsFavorite);
         }
 
         /// <summary>
@@ -56,7 +34,7 @@ namespace MarcerGameDvdLauncher
         /// </summary>
         public void RefreshView(int availableLines)
         {
-            _navigationController.UpdateScrollOffset(_gameEntries.Count, availableLines);
+            navigationController.UpdateScrollOffset(_gameEntries.Count, availableLines);
             DrawMenu(availableLines);
         }
 
@@ -68,9 +46,9 @@ namespace MarcerGameDvdLauncher
             try
             {
                 // If we are at the virtual Favorites folder, produce the flat list from the favorites service
-                if (string.Equals(_navigationController.CurrentRelativePath, FavoritesService.FavoritesRootName, StringComparison.OrdinalIgnoreCase))
+                if (string.Equals(navigationController.CurrentRelativePath, FavoritesService.FavoritesRootName, StringComparison.OrdinalIgnoreCase))
                 {
-                    var favs = _favoritesService.GetAll();
+                    var favs = favoritesService.GetAll();
                     _gameEntries = new List<GameEntry>();
                     foreach (var p in favs)
                     {
@@ -85,15 +63,15 @@ namespace MarcerGameDvdLauncher
                             IsVirtual = false
                         });
                     }
-                    _navigationController.SetEntriesCount(_gameEntries.Count);
+                    navigationController.SetEntriesCount(_gameEntries.Count);
                     return;
                 }
 
                 // Otherwise use the overlay directory browser for normal folders
-                _gameEntries = _directoryBrowser.GetEntries(_navigationController.CurrentRelativePath);
+                _gameEntries = directoryBrowser.GetEntries(navigationController.CurrentRelativePath);
 
                 // If we are at the root and there are favorites, prepend a virtual Favorites folder
-                if (string.IsNullOrEmpty(_navigationController.CurrentRelativePath) && _favoritesService.HasFavorites())
+                if (string.IsNullOrEmpty(navigationController.CurrentRelativePath) && favoritesService.HasFavorites())
                 {
                     var virtualEntry = new GameEntry
                     {
@@ -108,14 +86,14 @@ namespace MarcerGameDvdLauncher
                     _gameEntries.Insert(0, virtualEntry);
                 }
 
-                _navigationController.SetEntriesCount(_gameEntries.Count);
+                navigationController.SetEntriesCount(_gameEntries.Count);
             }
             catch (Exception ex)
             {
                 // Show the error to the user and continue with an empty list
-                _errorService.ShowError(ex.Message);
+                errorService.ShowError(ex.Message);
                 _gameEntries = new List<GameEntry>();
-                _navigationController.SetEntriesCount(0);
+                navigationController.SetEntriesCount(0);
             }
         }
 
@@ -126,9 +104,9 @@ namespace MarcerGameDvdLauncher
         {
             if (key.KeyChar == '?')
             {
-                _menuRenderer.ShowHelpBox(availableLines);
+                menuRenderer.ShowHelpBox(availableLines);
                 Console.ReadKey(intercept: true);
-                _menuRenderer.InvalidateCache();
+                menuRenderer.InvalidateCache();
                 DrawMenu(availableLines);
                 ProgramHelpers.FlushInputBuffer();
                 return false;
@@ -138,16 +116,16 @@ namespace MarcerGameDvdLauncher
             {
                 case ConsoleKey.UpArrow:
                     {
-                        int previousSelectedIndex = _navigationController.SelectedIndex;
-                        bool didScroll = _navigationController.MoveUp(_gameEntries, availableLines);
+                        int previousSelectedIndex = navigationController.SelectedIndex;
+                        bool didScroll = navigationController.MoveUp(_gameEntries, availableLines);
                         if (didScroll)
                         {
                             DrawMenu(availableLines);
                         }
                         else
                         {
-                            _menuRenderer.RedrawEntry(_gameEntries, previousSelectedIndex, previousSelectedIndex - _navigationController.ScrollOffset, false, availableLines, IsFavorite);
-                            _menuRenderer.RedrawEntry(_gameEntries, _navigationController.SelectedIndex, _navigationController.SelectedIndex - _navigationController.ScrollOffset, true, availableLines, IsFavorite);
+                            menuRenderer.RedrawEntry(_gameEntries, previousSelectedIndex, previousSelectedIndex - navigationController.ScrollOffset, false, availableLines, IsFavorite);
+                            menuRenderer.RedrawEntry(_gameEntries, navigationController.SelectedIndex, navigationController.SelectedIndex - navigationController.ScrollOffset, true, availableLines, IsFavorite);
                         }
                         // flush input to avoid key repeat
                         ProgramHelpers.FlushInputBuffer();
@@ -155,16 +133,16 @@ namespace MarcerGameDvdLauncher
                     break;
                 case ConsoleKey.DownArrow:
                     {
-                        int previousSelectedIndex = _navigationController.SelectedIndex;
-                        bool didScroll = _navigationController.MoveDown(_gameEntries, availableLines);
+                        int previousSelectedIndex = navigationController.SelectedIndex;
+                        bool didScroll = navigationController.MoveDown(_gameEntries, availableLines);
                         if (didScroll)
                         {
                             DrawMenu(availableLines);
                         }
                         else
                         {
-                            _menuRenderer.RedrawEntry(_gameEntries, previousSelectedIndex, previousSelectedIndex - _navigationController.ScrollOffset, false, availableLines, IsFavorite);
-                            _menuRenderer.RedrawEntry(_gameEntries, _navigationController.SelectedIndex, _navigationController.SelectedIndex - _navigationController.ScrollOffset, true, availableLines, IsFavorite);
+                            menuRenderer.RedrawEntry(_gameEntries, previousSelectedIndex, previousSelectedIndex - navigationController.ScrollOffset, false, availableLines, IsFavorite);
+                            menuRenderer.RedrawEntry(_gameEntries, navigationController.SelectedIndex, navigationController.SelectedIndex - navigationController.ScrollOffset, true, availableLines, IsFavorite);
                         }
                         ProgramHelpers.FlushInputBuffer();
                     }
@@ -172,26 +150,26 @@ namespace MarcerGameDvdLauncher
                 case ConsoleKey.Enter:
                 case ConsoleKey.RightArrow:
                     {
-                        var oldRelativePath = _navigationController.CurrentRelativePath;
-                        var isDirectory = _gameEntries.Count > 0 && _gameEntries[_navigationController.SelectedIndex].Kind == EntryKind.Directory;
-                        _navigationController.HandleEnter(_gameEntries);
-                        if (isDirectory && oldRelativePath != _navigationController.CurrentRelativePath)
+                        var oldRelativePath = navigationController.CurrentRelativePath;
+                        var isDirectory = _gameEntries.Count > 0 && _gameEntries[navigationController.SelectedIndex].Kind == EntryKind.Directory;
+                        navigationController.HandleEnter(_gameEntries);
+                        if (isDirectory && oldRelativePath != navigationController.CurrentRelativePath)
                         {
                             ReloadGameEntries();
-                            _navigationController.UpdateScrollOffset(_gameEntries.Count, availableLines);
+                            navigationController.UpdateScrollOffset(_gameEntries.Count, availableLines);
                         }
                         DrawMenu(availableLines);
                         // Only start a ZIP if NOT switching to a directory
-                        if (!isDirectory && _gameEntries.Count > 0 && _gameEntries[_navigationController.SelectedIndex].Kind == EntryKind.Zip)
+                        if (!isDirectory && _gameEntries.Count > 0 && _gameEntries[navigationController.SelectedIndex].Kind == EntryKind.Zip)
                         {
-                            string zipToLaunch = _gameEntries[_navigationController.SelectedIndex].InPatch ? _gameEntries[_navigationController.SelectedIndex].PatchPath : _gameEntries[_navigationController.SelectedIndex].RootPath;
+                            string zipToLaunch = _gameEntries[navigationController.SelectedIndex].InPatch ? _gameEntries[navigationController.SelectedIndex].PatchPath : _gameEntries[navigationController.SelectedIndex].RootPath;
                             try
                             {
-                                _hatariLauncher.Launch(zipToLaunch);
+                                hatariLauncher.Launch(zipToLaunch);
                             }
                             catch (Exception ex)
                             {
-                                _errorService.ShowError(ex.Message);
+                                errorService.ShowError(ex.Message);
                             }
                         }
                         // flush input to avoid leftover key events after an enter/navigation
@@ -201,23 +179,23 @@ namespace MarcerGameDvdLauncher
                 case ConsoleKey.Backspace:
                 case ConsoleKey.LeftArrow:
                     {
-                        _navigationController.GoUpDirectory();
+                        navigationController.GoUpDirectory();
                         ReloadGameEntries();
-                        _navigationController.UpdateScrollOffset(_gameEntries.Count, availableLines);
+                        navigationController.UpdateScrollOffset(_gameEntries.Count, availableLines);
                         DrawMenu(availableLines);
                         ProgramHelpers.FlushInputBuffer();
                     }
                     break;
                 case ConsoleKey.PageDown:
                     {
-                        _navigationController.PageDown(_gameEntries, availableLines);
+                        navigationController.PageDown(_gameEntries, availableLines);
                         DrawMenu(availableLines);
                         ProgramHelpers.FlushInputBuffer();
                     }
                     break;
                 case ConsoleKey.PageUp:
                     {
-                        _navigationController.PageUp(_gameEntries, availableLines);
+                        navigationController.PageUp(_gameEntries, availableLines);
                         DrawMenu(availableLines);
                         ProgramHelpers.FlushInputBuffer();
                     }
@@ -226,17 +204,17 @@ namespace MarcerGameDvdLauncher
                 case ConsoleKey.Oem8:
                     {
                         // Toggle favorite for selected ZIP (handles numpad * and some layouts)
-                        if (_gameEntries.Count > 0 && _gameEntries[_navigationController.SelectedIndex].Kind == EntryKind.Zip)
+                        if (_gameEntries.Count > 0 && _gameEntries[navigationController.SelectedIndex].Kind == EntryKind.Zip)
                         {
-                            var ge = _gameEntries[_navigationController.SelectedIndex];
+                            var ge = _gameEntries[navigationController.SelectedIndex];
                             string path = ge.InPatch ? ge.PatchPath : ge.RootPath;
                             try
                             {
-                                _favoritesService.Toggle(path);
+                                favoritesService.Toggle(path);
                             }
                             catch (Exception ex)
                             {
-                                _errorService.ShowError("Failed to toggle favorite: " + ex.Message);
+                                errorService.ShowError("Failed to toggle favorite: " + ex.Message);
                             }
                             // Redraw the whole menu so the '*' marker updates immediately
                             DrawMenu(availableLines);

src/MarcerGameDvdLauncher/MenuRenderer.cs

@@ -3,7 +3,7 @@
 
 namespace MarcerGameDvdLauncher
 {
-    public class MenuRenderer
+    public class MenuRenderer(AppColorConfig? colors = null)
     {
         // Simple line-based double buffer to avoid full Clear() flicker.
         // cachedBuffer holds the last rendered text and colors for each visible row.
@@ -12,12 +12,7 @@ namespace MarcerGameDvdLauncher
         private int _cachedWidth = -1;
 
         // Color configuration (injected; defaults to built-in scheme if null)
-        private readonly AppColorConfig _colors;
-
-        public MenuRenderer(AppColorConfig? colors = null)
-        {
-            _colors = colors ?? new AppColorConfig();
-        }
+        private readonly AppColorConfig _colors = colors ?? new AppColorConfig();
 
         // availableLines is provided per-draw so the renderer adapts to console resizes
         public void DrawMenu(List<GameEntry> entries, int scrollOffset, int selectedIndex, int availableLines, Func<GameEntry, bool>? isFavorite = null)
@@ -140,53 +135,40 @@ namespace MarcerGameDvdLauncher
 
         // Renders a centered, bordered help box with key bindings inside the
         // available console area. The caller is responsible for waiting on a
-        // key and redrawing the menu afterwards.
+        // key and redrawing the menu afterward.
         public void ShowHelpBox(int availableLines)
         {
-            try
+            var width = Console.WindowWidth;
+            var helpLines = GetHelpLines();
+            var boxHeight = Math.Min(helpLines.Length + 2, Math.Max(3, availableLines));
+            var boxWidth = Math.Max(1, width);
+            var topRow = Math.Max(0, (availableLines - boxHeight) / 2);
+
+            Console.BackgroundColor = ConsoleColor.DarkGray;
+            Console.ForegroundColor = ConsoleColor.White;
+
+            var topBorder = "+" + new string('-', Math.Max(0, boxWidth - 2)) + "+";
+            Console.SetCursorPosition(0, topRow);
+            Console.Write(topBorder);
+
+            for (var i = 0; i < boxHeight - 2; i++)
             {
-                int width = Console.WindowWidth;
-                string[] helpLines = GetHelpLines();
-                int boxHeight = Math.Min(helpLines.Length + 2, Math.Max(3, availableLines));
-                int boxWidth = Math.Max(1, width);
-                int topRow = Math.Max(0, (availableLines - boxHeight) / 2);
-
-                Console.BackgroundColor = ConsoleColor.DarkGray;
-                Console.ForegroundColor = ConsoleColor.White;
-
-                string topBorder = "+" + new string('-', Math.Max(0, boxWidth - 2)) + "+";
-                Console.SetCursorPosition(0, topRow);
-                Console.Write(topBorder);
-
-                for (int i = 0; i < boxHeight - 2; i++)
-                {
-                    int row = topRow + 1 + i;
-                    string content;
-                    if (i < helpLines.Length)
-                    {
-                        content = PadToWidth(helpLines[i], boxWidth - 2);
-                    }
-                    else
-                    {
-                        content = new string(' ', Math.Max(0, boxWidth - 2));
-                    }
-                    Console.SetCursorPosition(0, row);
-                    Console.Write("|" + content + "|");
-                }
-
-                int bottomRow = topRow + boxHeight - 1;
-                if (bottomRow < Console.WindowHeight)
-                {
-                    string bottomBorder = "+" + new string('-', Math.Max(0, boxWidth - 2)) + "+";
-                    Console.SetCursorPosition(0, bottomRow);
-                    Console.Write(bottomBorder);
-                }
-
-                Console.ResetColor();
+                var row = topRow + 1 + i;
+                var content = i < helpLines.Length
+                    ? PadToWidth(helpLines[i], boxWidth - 2)
+                    : new string(' ', Math.Max(0, boxWidth - 2));
+                Console.SetCursorPosition(0, row);
+                Console.Write("|" + content + "|");
             }
-            catch
+
+            var bottomRow = topRow + boxHeight - 1;
+            if (bottomRow < Console.WindowHeight)
             {
+                var bottomBorder = "+" + new string('-', Math.Max(0, boxWidth - 2)) + "+";
+                Console.SetCursorPosition(0, bottomRow);
+                Console.Write(bottomBorder);
             }
+            Console.ResetColor();
         }
 
         private static string[] GetHelpLines()
@@ -235,7 +217,7 @@ namespace MarcerGameDvdLauncher
         {
             if (width <= 0) return string.Empty;
 
-            string label = GetLabel(e, isFavorite);
+            var label = GetLabel(e, isFavorite);
 
             // If the console width is smaller than the label, truncate the label
             if (width <= label.Length)
@@ -243,7 +225,7 @@ namespace MarcerGameDvdLauncher
                 return label.Substring(0, width);
             }
 
-            int maxNameLen = width - label.Length; // space left for name
+            var maxNameLen = width - label.Length; // space left for name
             string displayName;
             if (e.Name.Length <= maxNameLen)
             {
@@ -257,7 +239,7 @@ namespace MarcerGameDvdLauncher
                     displayName = e.Name.Substring(0, Math.Max(0, maxNameLen));
             }
 
-            int padding = Math.Max(0, width - label.Length - displayName.Length);
+            var padding = Math.Max(0, width - label.Length - displayName.Length);
             var result = label + displayName + new string(' ', padding);
             // Ensure exact width (defensive): truncate or pad if needed
             if (result.Length > width) return result.Substring(0, width);
@@ -273,7 +255,7 @@ namespace MarcerGameDvdLauncher
         {
             // Layer label (7 chars)
             string layer;
-            if (e.InRoot && e.InPatch) layer = "[BOTH] ";
+            if (e is {InRoot: true, InPatch: true}) layer = "[BOTH] ";
             else if (e.InPatch) layer = "[PTCH] ";
             else if (e.InRoot) layer = "[ROOT] ";
             else layer = "       ";
@@ -299,15 +281,15 @@ namespace MarcerGameDvdLauncher
 
             if (e.Kind == EntryKind.Directory)
             {
-                if (e.InRoot && e.InPatch) return _colors.FolderBoth;       // Both layers
-                if (e.InPatch && !e.InRoot) return _colors.FolderPatchOnly;  // Only patch
-                if (e.InRoot && !e.InPatch) return _colors.FolderRootOnly;   // Only root
+                if (e is {InRoot: true, InPatch: true}) return _colors.FolderBoth;       // Both layers
+                if (e is {InPatch: true, InRoot: false}) return _colors.FolderPatchOnly;  // Only patch
+                if (e is {InRoot: true, InPatch: false}) return _colors.FolderRootOnly;   // Only root
             }
             else if (e.Kind == EntryKind.Zip)
             {
-                if (e.InRoot && e.InPatch) return _colors.ZipBoth;           // Both layers
-                if (e.InRoot && !e.InPatch) return _colors.ZipRootOnly;     // Only root
-                if (e.InPatch && !e.InRoot) return _colors.ZipPatchOnly;     // Only patch
+                if (e is {InRoot: true, InPatch: true}) return _colors.ZipBoth;           // Both layers
+                if (e is { InRoot: true, InPatch: false }) return _colors.ZipRootOnly;     // Only root
+                if (e is {InPatch: true, InRoot: false}) return _colors.ZipPatchOnly;     // Only patch
             }
             return ConsoleColor.DarkGray;
         }

src/MarcerGameDvdLauncher/NavigationController.cs

@@ -8,11 +8,11 @@ namespace MarcerGameDvdLauncher
         // Scroll fractions: when the selection cursor reaches 2/3 of the visible window
         // height from the top, the list scrolls down; when it reaches 1/3, it scrolls up.
         // Not configurable — these ratios are the established navigation behaviour.
-        private const double BottomScrollFraction = 2.0 / 3.0;
-        private const double TopScrollFraction = 1.0 / 3.0;
+        private const double BOTTOM_SCROLL_FRACTION = 2.0 / 3.0;
+        private const double TOP_SCROLL_FRACTION = 1.0 / 3.0;
 
-        public int SelectedIndex { get; private set; } = 0;
-        public int ScrollOffset { get; private set; } = 0;
+        public int SelectedIndex { get; private set; }
+        public int ScrollOffset { get; private set; }
         public string CurrentRelativePath { get; private set; } = "";
         // Stores the last selection & scroll position for each directory
         private readonly Dictionary<string, (int sel, int scroll)> _lastSelections = new();
@@ -105,12 +105,12 @@ namespace MarcerGameDvdLauncher
             if (availableLines < 1) availableLines = 1;
             if (entryCount <= availableLines) { ScrollOffset = 0; return; }
             if (SelectedIndex == 0) { ScrollOffset = 0; return; }
-            int bottomScrollTrigger = ScrollOffset + (int)(availableLines * BottomScrollFraction);
-            int topScrollTrigger = ScrollOffset + (int)(availableLines * TopScrollFraction);
+            int bottomScrollTrigger = ScrollOffset + (int)(availableLines * BOTTOM_SCROLL_FRACTION);
+            int topScrollTrigger = ScrollOffset + (int)(availableLines * TOP_SCROLL_FRACTION);
             if (SelectedIndex >= bottomScrollTrigger && (ScrollOffset + availableLines) < entryCount)
-                ScrollOffset = SelectedIndex - (int)(availableLines * BottomScrollFraction);
+                ScrollOffset = SelectedIndex - (int)(availableLines * BOTTOM_SCROLL_FRACTION);
             else if (SelectedIndex < topScrollTrigger && ScrollOffset > 0)
-                ScrollOffset = SelectedIndex - (int)(availableLines * TopScrollFraction);
+                ScrollOffset = SelectedIndex - (int)(availableLines * TOP_SCROLL_FRACTION);
             if (ScrollOffset < 0) ScrollOffset = 0;
             if (ScrollOffset > entryCount - availableLines)
                 ScrollOffset = entryCount - availableLines;

src/MarcerGameDvdLauncher/OverlayDirectoryBrowser.cs

@@ -19,16 +19,16 @@ namespace MarcerGameDvdLauncher
 
     public class OverlayDirectoryBrowser(string root, string patch)
     {
-        public List<GameEntry> GetEntries(string currentRelativePath)
+        public List<GameEntry> GetEntries(string? currentRelativePath)
         {
             try
             {
                 // Normalize and protect against path traversal or absolute paths in the relative path
-                string rel = currentRelativePath ?? string.Empty;
+                var rel = currentRelativePath ?? string.Empty;
                 // Remove any leading directory separators
                 rel = rel.TrimStart(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
                 // If the relative path is rooted or contains parent directory segments, reset to root
-                if (Path.IsPathRooted(rel) || rel.Split(new[] { Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar }, StringSplitOptions.RemoveEmptyEntries).Any(p => p == ".."))
+                if (Path.IsPathRooted(rel) || rel.Split([Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar], StringSplitOptions.RemoveEmptyEntries).Any(p => p == ".."))
                 {
                     rel = string.Empty;
                 }

src/MarcerGameDvdLauncher/Program.cs

@@ -6,11 +6,11 @@ namespace MarcerGameDvdLauncher
     class Program
     {
         // Console window title. Not configurable — fixed application display name.
-        private const string DefaultTitle = "Marcer GameDVD Launcher";
+        private const string DEFAULT_TITLE = "Marcer GameDVD Launcher";
 
         static void Main(string[] args)
         {
-            Console.Title = DefaultTitle;
+            Console.Title = DEFAULT_TITLE;
             var app = new LauncherApp();
             app.Run();
         }

src/MarcerGameDvdLauncher/ProgramHelpers.cs

@@ -1,7 +1,6 @@
 // Copyright (c) 2026 Stefan Koelle (https://stefankoelle.de)
 // Licensed under the MIT License. See LICENSE file in project root for details.
 
-using System;
 using System.Runtime.InteropServices;
 
 namespace MarcerGameDvdLauncher
@@ -40,11 +39,11 @@ namespace MarcerGameDvdLauncher
         // These are defined by the Windows API and do not change.
         private const int STD_INPUT_HANDLE = -10;
 
-        [System.Runtime.InteropServices.DllImport("kernel32.dll")]
+        [DllImport("kernel32.dll")]
         private static extern IntPtr GetStdHandle(int nStdHandle);
 
-        [System.Runtime.InteropServices.DllImport("kernel32.dll", SetLastError = true)]
-        [return: System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Bool)]
+        [DllImport("kernel32.dll", SetLastError = true)]
+        [return: MarshalAs(UnmanagedType.Bool)]
         private static extern bool FlushConsoleInputBuffer(IntPtr hConsoleInput);
 
         // P/Invoke to query key state (used to detect physical key release)
@@ -59,16 +58,16 @@ namespace MarcerGameDvdLauncher
         // then removed and the method returns. This is designed to be a
         // lightweight modal for the console UI and uses the last console line
         // which the application reserves for transient messages.
-        public static void ShowModalUntilReturnReleased(string message)
+        public static void ShowModalUntilReturnReleased(string? message)
         {
             try
             {
-                int lastRow = AvailableLines;
-                int width = Console.WindowWidth;
-                string text = message ?? string.Empty;
+                var lastRow = AvailableLines;
+                var width = Console.WindowWidth;
+                var text = message ?? string.Empty;
                 if (text.Length > width) text = text.Substring(0, Math.Max(0, width - 3)) + "...";
-                int padding = Math.Max(0, width - text.Length);
-                string line = text + new string(' ', padding);
+                var padding = Math.Max(0, width - text.Length);
+                var line = text + new string(' ', padding);
 
                 Console.BackgroundColor = ConsoleColor.DarkGray;
                 Console.ForegroundColor = ConsoleColor.White;