initial port of the UI kit

go/cmd/examples/go-wasm-web/css/app.css

@@ -0,0 +1,14 @@
+@import "tailwindcss";
+
+/* App-side design tokens the webui kit references (Tailwind v4 @theme). Brand
+   values live with the app; the kit stays generic. */
+@theme {
+  --radius-default: 0.375rem;
+
+  --color-primary: #4f46e5;
+  --color-primary-hover: #4338ca;
+
+  --color-text-heading: #111827;
+  --color-text-on-dark: #f9fafb;
+  --color-text-on-dark-muted: #9ca3af;
+}