Refactor Button component in Prospects.razor for improved styling and structure

FoodsharingSiegen.Server/Pages/Prospects.razor

@@ -16,11 +16,17 @@
 
 <Button
     Color="Color.Primary"
+    Width="Width.Px(50)"
+    Height="Height.Px(50)"
+    title="Hinzufügen"
+    style="min-width: auto;"
     Clicked="@CreateProspectAsync"
     Visibility="@(CurrentUser.IsInGroup(UserGroup.WelcomeTeam, UserGroup.Ambassador) ? Visibility.Default : Visibility.Invisible)"
->Hinzufügen
+><i class="fa-solid fa-plus"></i>
 </Button>
 
+
+
 @{
     var filterList = ProspectList.ApplyFilter(Filter);
 }