[backend/razor] Add host-part to user public preview

Iceshrimp.Backend/Pages/User.cshtml

@@ -32,7 +32,7 @@ else
             <div class="title">
                 <span>@(Model.User.DisplayName ?? Model.User.Username)</span>
             </div>
-            <span class="acct">@@@Model.User.Acct</span>
+            <span class="acct">@@@Model.User.Username<span class="host">@@@Model.User.Host</span></span>
         </div>
         <div class="bio">
             @Html.Raw(Model.Bio ?? "<i>This user hasn't added a bio yet.</i>")

Iceshrimp.Backend/Pages/User.cshtml.cs

@@ -65,6 +65,9 @@ public class UserModel(
 		if (User is { AvatarUrl: null } || (User is not null && !ShowMedia))
 			User.AvatarUrl = User.GetIdenticonUrl(instance.Value);
 
+		if (User is { Host: null })
+			User.Host = instance.Value.AccountDomain;
+
 		return Page();
 	}
 }

Iceshrimp.Backend/Pages/User.cshtml.css

@@ -42,3 +42,7 @@
     grid-row: 2;
     padding-left: 10px;
 }
+
+.host {
+    color: var(--text-dim);
+}

Iceshrimp.Backend/wwwroot/css/default.css

@@ -10,6 +10,7 @@
     --text-main: #dbdbdb;
     --text-bright: #fff;
     --text-muted: #a9b1ba;
+    --text-dim: #9aa2aa;
     --links: #41adff;
     --focus: #0096bfab;
     --border: #526980;