Honor button typography and radius across email formats

packages/email-renderer/test/button-brand.test.ts

@@ -2,6 +2,32 @@ import { expect, test } from "bun:test";
 import type { BlockDocument } from "@wrnexus/blocks";
 import { renderEmail, validateMjml } from "../src/index.ts";
 
+test("button typography and corners reach the clickable element in every target", async () => {
+  const document: BlockDocument = {
+    schemaVersion: 1, kind: "email", meta: { subject: "Styled CTA", lang: "en" }, theme: { tokens: {} },
+    root: { id: "root", type: "layout.email-document", version: 1, props: { width: "600" }, styles: {}, slots: {
+      content: [{ id: "cta", type: "content.button", version: 1, props: { label: "Read more", href: "https://example.com" }, styles: {
+        color: { base: "#123456" }, fontSize: { base: "22px" }, fontWeight: { base: "400" }, borderRadius: { base: "18px" },
+      }, slots: {} }],
+    } },
+  };
+  const before = structuredClone(document);
+  const result = await renderEmail(document, { amp: true, mjml: true, ampValidationTimeoutMs: 10000 });
+  expect(result.ok).toBe(true);
+  if (!result.ok) return;
+  const anchor = result.value.parts.html.content.match(/<a href="https:\/\/example.com" style="([^"]+)"/)?.[1];
+  for (const declaration of ["color:#123456", "font-size:22px", "font-weight:400", "border-radius:18px"]) {
+    expect(anchor).toContain(declaration);
+    expect(result.value.parts.amp?.content).toContain(declaration);
+  }
+  expect(result.value.parts.amp?.validation.valid).toBe(true);
+  for (const attribute of ['color="#123456"', 'font-size="22px"', 'font-weight="400"', 'border-radius="18px"']) {
+    expect(result.value.exports?.mjml).toContain(attribute);
+  }
+  expect(await validateMjml(result.value.exports!.mjml!)).toEqual([]);
+  expect(document).toEqual(before);
+});
+
 test("button background inherits brand color with explicit semantic overrides across formats", async () => {
   for (const override of [undefined, "#aabbcc"]) {
     const document: BlockDocument = {