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 reference 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/catalog.test.ts

@@ -8,7 +8,7 @@ describe("template catalog", () => {
   it("has one entry per registered template, in the registry's order, ids unique", () => {
     expect(TEMPLATE_CATALOG.map((e) => e.id)).toEqual(Object.keys(TEMPLATES));
     expect(new Set(TEMPLATE_CATALOG.map((e) => e.id)).size).toBe(TEMPLATE_CATALOG.length);
-    expect(TEMPLATE_CATALOG).toHaveLength(8);
+    expect(TEMPLATE_CATALOG).toHaveLength(10);
   });
 
   it("groups the C4 templates into the Ledger and Band families", () => {