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/band/band.test.tsx

@@ -51,7 +51,7 @@ describe("registry and catalog", () => {
       expect(catalogEntry(t.id).name).toBe(t.name);
       expect(existsSync(path.join(process.cwd(), "public", t.thumbnail)), t.thumbnail).toBe(true);
     }
-    expect(Object.keys(TEMPLATES)).toEqual(["classic", "linea", "monogram", "serenity", "crimson-grid", "tangerine-ledger", "slate-band", "teal-swoosh"]);
+    expect(Object.keys(TEMPLATES)).toEqual(["classic", "linea", "monogram", "serenity", "crimson-grid", "tangerine-ledger", "slate-band", "teal-swoosh", "purple-pop", "citrus-split"]);
   });
 
   it("both are Montserrat throughout, and their slots are the measured reference ones", () => {