feat(ui): constrain decimal input and add stacked timed toasts with uniform actions

src/Duempelkas.Infrastructure/Services/SettingsService.cs

@@ -5,9 +5,10 @@ namespace Duempelkas.Infrastructure.Services;
 
 public class SettingsService : ISettingsService
 {
-    private static readonly string SettingsPath = Path.Combine(
-        Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
-        "Duempelkas", "settings.json");
+    private readonly string SettingsPath;
+
+    public SettingsService(string? directory = null) => SettingsPath = Path.Combine(directory ?? Path.Combine(
+        Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "Duempelkas"), "settings.json");
 
     private static readonly JsonSerializerOptions JsonOptions = new() { WriteIndented = true };
 
@@ -24,7 +25,7 @@ public class SettingsService : ISettingsService
         await SaveAsync(settings);
     }
 
-    private static async Task<AppSettings> LoadAsync()
+    private async Task<AppSettings> LoadAsync()
     {
         if (!File.Exists(SettingsPath))
             return new AppSettings();
@@ -40,7 +41,7 @@ public class SettingsService : ISettingsService
         }
     }
 
-    private static async Task SaveAsync(AppSettings settings)
+    private async Task SaveAsync(AppSettings settings)
     {
         var dir = Path.GetDirectoryName(SettingsPath)!;
         Directory.CreateDirectory(dir);