fix(email-renderer): inherit global brand fonts in content blocks

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

@@ -56,6 +56,17 @@ const document: BlockDocument = {
 };
 
 describe("email renderer", () => {
+  test("content inherits the selected brand font instead of overriding it", async () => {
+    const branded = structuredClone(document);
+    branded.root.props.fontFamily = "Georgia, serif";
+    const result = await renderEmail(branded);
+    expect(result.ok).toBe(true);
+    if (!result.ok) return;
+    expect(result.value.parts.html.content).toContain("font-family:Georgia, serif");
+    expect(result.value.parts.html.content).not.toContain("font-family:Arial");
+    expect(result.value.parts.html.content).toContain('<h1 style="font-family:inherit');
+    expect(result.value.parts.html.content).toContain("display:inline-block;font-family:inherit");
+  });
   test("browser HTML parsing preserves every block inside its section", async () => {
     const rendered = await renderEmail(document);
     expect(rendered.ok).toBe(true);