Generate navigation and render page embeds from PocketBase

Elternbeirat.Web.Tests/NavBuilderTests.cs

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+using Elternbeirat.Contracts;
+using Elternbeirat.Web.Features.Layout;
+
+namespace Elternbeirat.Web.Tests;
+
+/// <summary>
+/// Unit tests for the navigation builder. Pure logic, no PocketBase needed.
+/// </summary>
+public class NavBuilderTests
+{
+    private static Page Page(string slug, string location, double order, string title) =>
+        new() { Slug = slug, Location = location, Order = order, Title = title };
+
+    [Fact]
+    public void Header_keeps_only_header_pages_ordered_by_order()
+    {
+        var pages = new[]
+        {
+            Page("board", "header", 2, "Vorstandsteam"),
+            Page("home", "header", 1, "Start"),
+            Page("imprint", "footer", 1, "Impressum"),
+            Page("hidden", "", 1, "Unterseite"),
+        };
+
+        var header = NavBuilder.Header(pages);
+
+        header.Select(link => link.Title).ShouldBe(["Start", "Vorstandsteam"]);
+    }
+
+    [Fact]
+    public void Footer_keeps_only_footer_pages_ordered_by_order()
+    {
+        var pages = new[]
+        {
+            Page("privacy", "footer", 2, "Datenschutz"),
+            Page("imprint", "footer", 1, "Impressum"),
+            Page("home", "header", 1, "Start"),
+        };
+
+        var footer = NavBuilder.Footer(pages);
+
+        footer.Select(link => link.Title).ShouldBe(["Impressum", "Datenschutz"]);
+    }
+
+    [Fact]
+    public void Home_page_maps_to_root_every_other_slug_to_its_path()
+    {
+        var pages = new[]
+        {
+            Page("home", "header", 1, "Start"),
+            Page("board", "header", 2, "Vorstandsteam"),
+        };
+
+        var header = NavBuilder.Header(pages);
+
+        header[0].Href.ShouldBe("/");
+        header[1].Href.ShouldBe("/board");
+    }
+
+    [Fact]
+    public void Pages_without_a_location_never_appear_in_a_menu()
+    {
+        var pages = new[] { Page("hidden", "", 1, "Unterseite") };
+
+        NavBuilder.Header(pages).ShouldBeEmpty();
+        NavBuilder.Footer(pages).ShouldBeEmpty();
+    }
+}