Add ProspectSortOption enum and implement sorting dialog with buttons

FoodsharingSiegen.Contracts/Enums/ProspectSortOption.cs

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+namespace FoodsharingSiegen.Contracts.Enums
+{
+    public enum ProspectSortOption
+    {
+        NameAscending,
+        NameDescending,
+        ModifiedAscending,
+        ModifiedDescending
+    }
+}

FoodsharingSiegen.Server/Dialogs/ProspectSortDialog.razor

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+@inherits FsBase
+@using FoodsharingSiegen.Contracts.Enums
+
+<div class="d-grid gap-2">
+    <Button Color="@GetSortButtonColor(ProspectSortOption.NameAscending)" Clicked="() => SelectAsync(ProspectSortOption.NameAscending)">Name (aufsteigend)</Button>
+    <Button Color="@GetSortButtonColor(ProspectSortOption.NameDescending)" Clicked="() => SelectAsync(ProspectSortOption.NameDescending)">Name (absteigend)</Button>
+    <Button Color="@GetSortButtonColor(ProspectSortOption.ModifiedAscending)" Clicked="() => SelectAsync(ProspectSortOption.ModifiedAscending)">Geändert (aufsteigend)</Button>
+    <Button Color="@GetSortButtonColor(ProspectSortOption.ModifiedDescending)" Clicked="() => SelectAsync(ProspectSortOption.ModifiedDescending)">Geändert (absteigend)</Button>
+</div>

FoodsharingSiegen.Server/Dialogs/ProspectSortDialog.razor.cs

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+using Blazorise;
+using FoodsharingSiegen.Contracts.Enums;
+using FoodsharingSiegen.Server.BaseClasses;
+using Microsoft.AspNetCore.Components;
+
+namespace FoodsharingSiegen.Server.Dialogs
+{
+    public partial class ProspectSortDialog : FsBase
+    {
+        [Parameter]
+        public ProspectSortOption CurrentSort { get; set; } = ProspectSortOption.NameAscending;
+
+        [Parameter]
+        public Func<ProspectSortOption, Task>? OnSortSelected { get; set; }
+
+        public static async Task ShowAsync(IModalService modalService, ProspectSortOption currentSort, Func<ProspectSortOption, Task> onSortSelected)
+        {
+            await modalService.Show<ProspectSortDialog>("Sortieren", p =>
+            {
+                p.Add(nameof(CurrentSort), currentSort);
+                p.Add(nameof(OnSortSelected), onSortSelected);
+            }, new ModalInstanceOptions
+            {
+                Size = ModalSize.Small,
+            });
+        }
+
+        private Color GetSortButtonColor(ProspectSortOption option)
+        {
+            return CurrentSort == option ? Color.Success : Color.Secondary;
+        }
+
+        private async Task SelectAsync(ProspectSortOption option)
+        {
+            if (OnSortSelected != null) await OnSortSelected(option);
+            await ModalService.Hide();
+        }
+    }
+}