Add carousel navigation and the mixed checkbox state, without script

These were left out because daisyUI does them with scripts or with links that
<base href="/"> breaks.

DCarousel:
- ShowNavigation adds previous/next links on each slide, and ShowIndicators adds
  a row of numbered links under the strip.
- The links point at the slides' ids under the current path, so Blazor treats
  them as same-page fragments and scrolls the strip.

DCheckbox:
- Indeterminate renders aria-checked="mixed", which daisyUI draws like
  :indeterminate.
- A click clears it through IndeterminateChanged.
- The neo inset well leaves the mixed state alone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

Components/Daisy/DataInput/DCheckbox.razor

@@ -1,7 +1,8 @@
 @inherits DInputBase<bool>
 
 @* daisyUI Checkbox: https://daisyui.com/components/checkbox/ . With LabelText the checkbox sits in a <label class="label">
-   followed by the text, as in daisyUI's fieldset examples. *@
+   followed by the text, as in daisyUI's fieldset examples. Indeterminate renders aria-checked="mixed", which daisyUI
+   draws like the :indeterminate state that only script could set. *@
 @if (LabelText is null)
 {
 	@Checkbox
@@ -18,11 +19,15 @@ else
 	[Parameter] public DColor Color { get; set; }
 	[Parameter] public DSize Size { get; set; }
 	[Parameter] public string LabelText { get; set; }
+	/// <summary>The mixed state; a click clears it and reports false through IndeterminateChanged.</summary>
+	[Parameter] public bool Indeterminate { get; set; }
+	[Parameter] public EventCallback<bool> IndeterminateChanged { get; set; }
 
 	string CssClassFull => Cx("checkbox", IsInvalid ? "checkbox-error" : ColorClass, SizeClass, CssClass);
 
-	RenderFragment Checkbox => @<input @attributes="InputAttributes" type="checkbox" class="@CssClassFull" name="@NameAttributeValue"
-									   checked="@CurrentValue" @onchange="OnChange" aria-invalid="@(IsInvalid ? "true" : null)" />;
+	RenderFragment Checkbox => @<input @attributes="InputAttributes" type="checkbox" class="@CssClassFull" name="@NameAttribute"
+									   checked="@CurrentValue" @onchange="OnChange" aria-checked="@(Indeterminate ? "mixed" : null)"
+									   aria-invalid="@(IsInvalid ? "true" : null)" />;
 
 	string ColorClass => Color switch
 	{
@@ -46,5 +51,13 @@ else
 		_ => null
 	};
 
-	void OnChange(ChangeEventArgs e) => CurrentValue = e.Value is true;
+	async Task OnChange(ChangeEventArgs e)
+	{
+		CurrentValue = e.Value is true;
+		if (Indeterminate)
+		{
+			Indeterminate = false;
+			await IndeterminateChanged.InvokeAsync(false);
+		}
+	}
 }