feature: Phase 18.6 Track A — public Settings menu + streaming-quality toggle

DeepDrftPublic.Client/Common/SettingsItem.cs

@@ -0,0 +1,12 @@
+using Microsoft.AspNetCore.Components;
+
+namespace DeepDrftPublic.Client.Common;
+
+/// <summary>
+/// One entry in the public-site Settings menu (Phase 18 wave 18.6, §4a). The settings-item abstraction the
+/// menu renders instead of a hard-coded control list: a <see cref="Label"/> plus a <see cref="Control"/>
+/// fragment bound to a persisted preference. Adding a future tenant (e.g. dark mode) is appending one of
+/// these — not rewiring the menu. The control fragment owns its own binding to <see cref="PublicSiteSettings"/>
+/// and its own persistence call, so each item is self-contained and the menu stays preference-agnostic.
+/// </summary>
+public sealed record SettingsItem(string Label, RenderFragment Control);