feat: plakat redesign phase 1 (tokens, fonts, poster hero, header) (#74)

- New design tokens: signal red, ink and paper as RGB channels; ink and paper
  swap roles in dark mode so every component inverts cleanly
- Fonts via next/font: Bricolage Grotesque (with wdth/opsz axes), Geist,
  Geist Mono; drop Inter and Playfair
- Poster hero: kicker, giant DK0 wordmark that reacts to pointer distance
  (weight and width through a damped spring, desktop only, off for reduced
  motion), claim as h1, intro with thesis countdown, marquee strip
- Header in poster style: transparent over the red hero, paper strip with
  ink rule when scrolled or on subpages; drawer menu restyled
- Remove wavy SVG separators, CSS shader gradient, background blobs and
  unused providers that caused the pink/purple bands between sections
- Drop the global p/span/div color override so colors inherit properly
- New hero texts in de/en, tests and i18n key check updated

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/components/ClientProviders.tsx

@@ -1,31 +1,17 @@
 "use client";
 
-import React, { useEffect, useState } from "react";
-import { usePathname } from "next/navigation";
-import dynamic from "next/dynamic";
+import React from "react";
 import { MotionConfig } from "framer-motion";
 import { ToastProvider } from "@/components/Toast";
 import ErrorBoundary from "@/components/ErrorBoundary";
 import { ConsentProvider } from "./ConsentProvider";
 import { ThemeProvider } from "./ThemeProvider";
 
-const BackgroundBlobs = dynamic(
-  () => import("@/components/BackgroundBlobs").catch(() => ({ default: () => null })),
-  { ssr: false, loading: () => null }
-);
-
 export default function ClientProviders({
   children,
 }: {
   children: React.ReactNode;
 }) {
-  const [mounted, setMounted] = useState(false);
-  const pathname = usePathname();
-
-  useEffect(() => {
-    setMounted(true);
-  }, [pathname]);
-
   return (
     <ErrorBoundary>
       <ErrorBoundary>
@@ -33,7 +19,7 @@ export default function ClientProviders({
           <ThemeProvider>
             {/* Respect prefers-reduced-motion in every Framer Motion animation */}
             <MotionConfig reducedMotion="user">
-              <GatedProviders mounted={mounted}>
+              <GatedProviders>
                 {children}
               </GatedProviders>
             </MotionConfig>
@@ -44,31 +30,10 @@ export default function ClientProviders({
   );
 }
 
-function GatedProviders({
-  children,
-  mounted,
-}: {
-  children: React.ReactNode;
-  mounted: boolean;
-}) {
-  // Defer animated background blobs until after LCP
-  const [deferredReady, setDeferredReady] = useState(false);
-  useEffect(() => {
-    if (!mounted) return;
-    let id: ReturnType<typeof setTimeout> | number;
-    if (typeof requestIdleCallback !== "undefined") {
-      id = requestIdleCallback(() => setDeferredReady(true), { timeout: 5000 });
-      return () => cancelIdleCallback(id as number);
-    } else {
-      id = setTimeout(() => setDeferredReady(true), 200);
-      return () => clearTimeout(id);
-    }
-  }, [mounted]);
-
+function GatedProviders({ children }: { children: React.ReactNode }) {
   return (
     <ErrorBoundary>
       <ToastProvider>
-        {deferredReady && <BackgroundBlobs />}
         <div className="relative z-10">{children}</div>
       </ToastProvider>
     </ErrorBoundary>