Add the Northline template family: Purple Pop and Citrus Split

Purple Pop (cream page, purple pills, asterisk and dome decor, opt-in
logo) and Citrus Split (grey split panel, halftone chevrons, icon
contacts, logo in the measured slot) are rebuilt from the Canva PDFs on
the engine with A4/Letter support, GST slots and zero audit errors. Adds
static DM Sans, Jost and Poppins 800 as look-alikes for the commercial
fonts. The picker now lists ten templates.

src/pdf/templates/northline/layoutFor.tsx

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+import type { ComponentType } from "react";
+import type { TemplateProps } from "../contract";
+import { NorthlineLayout } from "./Layout";
+import type { NorthlineVariant } from "./variant";
+
+/** The family component bound to one variant's tokens, as the TemplateDefinition's Layout. */
+export function NorthlineLayoutFor(variant: NorthlineVariant): ComponentType<TemplateProps> {
+  const Layout = (props: TemplateProps) => <NorthlineLayout {...props} variant={variant} />;
+  Layout.displayName = `NorthlineLayout(${variant.id})`;
+  return Layout;
+}