Add the design foundation: self-hosted Nunito, type scale, new tokens and an Icon component

Elternbeirat.Web.Tests/IconSetTests.cs

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+using Elternbeirat.Web.Shared;
+
+namespace Elternbeirat.Web.Tests;
+
+/// <summary>
+/// Unit tests for the icon lookup behind the Icon component. Pure logic, no
+/// PocketBase needed.
+/// </summary>
+public class IconSetTests
+{
+    [Theory]
+    [InlineData("calendar")]
+    [InlineData("map-pin")]
+    [InlineData("help-circle")] // kept under its old name although Lucide renamed it
+    public void Known_name_returns_svg_markup(string name)
+    {
+        var markup = IconSet.Find(name);
+
+        markup.ShouldNotBeNullOrWhiteSpace();
+        markup.ShouldStartWith("<"); // SVG child elements, ready to inline
+    }
+
+    [Theory]
+    [InlineData("does-not-exist")]
+    [InlineData("Calendar")] // lookup is case-sensitive, names are code identifiers
+    [InlineData("")]
+    [InlineData(null)]
+    public void Unknown_name_returns_null(string? name) =>
+        IconSet.Find(name).ShouldBeNull();
+}