fix(email-renderer): validate brand settings and apply them to AMP

packages/email-renderer/src/blocks.ts

@@ -10,6 +10,7 @@ import {
   type BlockDefinition,
   type BlockNode,
 } from "@wrnexus/blocks";
+import { brandColor, brandFont, brandWidth } from "./brand.ts";
 
 const styles = record(json, { maxKeys: 50 }) as never;
 const label = (key: string, fallback: string) => ({ key, fallback });
@@ -72,12 +73,12 @@ export const emailDocumentBlock = defineBlock({
     category: "layout",
     capabilities: ["root"],
     props: object({
-      width: string({ default: "600" }),
-      background: string({ default: "#f3f4f6" }),
-      contentBackground: string({ default: "#ffffff" }),
-      fontFamily: string({ default: "Arial, sans-serif" }),
-      textColor: string({ default: "#111827" }),
-      linkColor: string({ default: "#2563eb" }),
+      width: brandWidth,
+      background: brandColor("#f3f4f6"),
+      contentBackground: brandColor("#ffffff"),
+      fontFamily: brandFont,
+      textColor: brandColor("#111827"),
+      linkColor: brandColor("#2563eb"),
       logoUrl: safeUrl({ schemes: ["https"], optional: true }),
       logoAlt: string({ max: 300, default: "" }),
     }) as never,