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/decor/AccentRule.tsx

@@ -0,0 +1,14 @@
+import { View } from "@react-pdf/renderer";
+import { pinned } from "../engine/columns";
+
+export interface AccentRuleProps {
+  width: number;
+  thickness: number;
+  color: string;
+  style?: Record<string, unknown>;
+}
+
+/** A solid bar in the flow (the Crimson header rule, the Slate/Teal total dash): an empty View, so a pinned height is allowed. */
+export function AccentRule({ width, thickness, color, style }: AccentRuleProps) {
+  return <View style={{ ...pinned(width), height: thickness, backgroundColor: color, ...style } as never} />;
+}