Add Ledger and Band template families with decor primitives

Crimson Grid, Tangerine Ledger, Slate Band and Teal Swoosh are rebuilt from
the reference PDFs with grid and band tables that survive page breaks,
full-bleed fixed bands, pennant tabs, gradient corner swooshes with
keep-outs, Carbon icon circles, and the user's logo in the measured slot
(knockout or white chip on the dark Slate band). Adds static Poppins
500-700 and Inter fonts. Thumbnails regenerated for all eight templates;
the item-count sweeps run in their own test file.

src/pdf/templates/catalog.test.ts

@@ -0,0 +1,38 @@
+import { existsSync } from "node:fs";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+import { catalogEntry, FAMILY_LABELS, TEMPLATE_CATALOG } from "./catalog";
+import { TEMPLATES } from "./registry";
+
+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);
+  });
+
+  it("groups the C4 templates into the Ledger and Band families", () => {
+    const byFamily = (f: string) => TEMPLATE_CATALOG.filter((e) => e.family === f).map((e) => e.id);
+    expect(byFamily("ledger")).toEqual(["crimson-grid", "tangerine-ledger"]);
+    expect(byFamily("band")).toEqual(["slate-band", "teal-swoosh"]);
+    expect(byFamily("neutral")).toEqual(["linea", "monogram", "serenity"]);
+    expect(FAMILY_LABELS.ledger).toBe("Ledger");
+    expect(FAMILY_LABELS.band).toBe("Band");
+  });
+
+  it("every entry has a name, a family label and a thumbnail on disk; every definition agrees", () => {
+    for (const e of TEMPLATE_CATALOG) {
+      expect(e.name.length, e.id).toBeGreaterThan(0);
+      expect(FAMILY_LABELS[e.family], e.id).toBeTruthy();
+      expect(e.thumbnail).toBe(`/templates/${e.id}.png`);
+      expect(existsSync(path.join(process.cwd(), "public", e.thumbnail)), e.thumbnail).toBe(true);
+      expect(TEMPLATES[e.id].family).toBe(e.family);
+      expect(TEMPLATES[e.id].name).toBe(e.name);
+    }
+  });
+
+  it("falls back to Classic for an unknown id", () => {
+    expect(catalogEntry("no-such").id).toBe("classic");
+    expect(catalogEntry("slate-band").name).toBe("Slate Band");
+  });
+});