feat(web): Pressing Plant design tokens + self-hosted Fraunces

globals.css defines the manila/spruce palette as CSS custom properties for
both themes (prefers-color-scheme + explicit data-theme override), paper
grain, base reset, focus-visible, reduced-motion. Fraunces vendored as woff2
and wired via next/font/local with a Palatino/Georgia fallback.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/app/fonts.ts

@@ -0,0 +1,11 @@
+import localFont from "next/font/local";
+
+// Fraunces — a warm, optical variable serif (Fontsource, latin wght axis).
+// Self-hosted so the container build needs no network and the CSP never bites.
+export const fraunces = localFont({
+  src: "../fonts/Fraunces.woff2",
+  variable: "--font-fraunces",
+  weight: "100 900",
+  display: "swap",
+  fallback: ["Palatino Linotype", "Palatino", "Book Antiqua", "Georgia", "serif"],
+});