feat(theme): ThemeScripts + localStorage nav-state enhancer

ZB.MOM.WW.Theme/tests/ZB.MOM.WW.Theme.Tests/StaticAssetsTests.cs

@@ -35,6 +35,10 @@ public class StaticAssetsTests
     public void Fonts_are_vendored(string file) =>
         Assert.True(File.Exists(Path.Combine(Wwwroot, "fonts", file)));
 
+    [Fact]
+    public void NavStateScript_ships() =>
+        Assert.True(File.Exists(Path.Combine(Wwwroot, "js", "nav-state.js")));
+
     // Theme-002: .chip-idle pairs the idle background with the matching --idle
     // foreground token (per DESIGN-TOKENS.md), not --ink-soft.
     [Fact]

ZB.MOM.WW.Theme/tests/ZB.MOM.WW.Theme.Tests/ThemeScriptsTests.cs

@@ -0,0 +1,13 @@
+namespace ZB.MOM.WW.Theme.Tests;
+
+public class ThemeScriptsTests : TestContext
+{
+    [Fact]
+    public void ThemeScripts_emits_nav_state_script_tag()
+    {
+        var cut = RenderComponent<ThemeScripts>();
+        var script = cut.Find("script");
+        Assert.Equal("_content/ZB.MOM.WW.Theme/js/nav-state.js", script.GetAttribute("src"));
+        Assert.True(script.HasAttribute("defer"));
+    }
+}