Hidden parts of the feed tabs and the megamenu are left out instead of hidden

A feed tab's name and the megamenu's toggle are now only rendered where they show, rather than rendered and then hidden
by a class, so nothing runs or ships for a part no one sees. The validator hint and the phone menu keep their hiding
class on purpose: the browser reveals the first, and the second is also the desktop sidebar. The house-rules checks move
to 1.1.0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01W4YtEJrgxG12Pc39Fai8Bd

Components/Daisy/Navigation/DMegamenu.razor

@@ -5,9 +5,15 @@
    Escape are the browser's. The root is a popover too: with Responsive it turns, below sm, into a vertical menu that
    the toggle button opens. daisyUI supports at most 10 items. text-inherit undoes the browser's popover CanvasText
    colour, which daisyUI resets for dropdowns but not here. *@
-@if (Responsive || Direction == DDirection.Vertical)
+@if (Direction == DDirection.Vertical)
 {
-	<button type="button" class="@Cx("btn", Direction == DDirection.Vertical ? null : "sm:hidden", ToggleClass)" popovertarget="@uid">
+	<button type="button" class="@Cx("btn", ToggleClass)" popovertarget="@uid">
+		@ToggleText
+	</button>
+}
+else if (Responsive)
+{
+	<button type="button" class="btn sm:hidden @ToggleClass" popovertarget="@uid">
 		@ToggleText
 	</button>
 }