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

- 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/__tests__/pre-push-check.test.ts

@@ -136,7 +136,7 @@ const STATIC_KEYS: Record<string, Record<string, string[]>> = {
     ProjectDetailClient: ["back"], ProjectsPageClient: ["backToHome"],
   },
   consent: { ConsentBanner: ["title", "description", "essential", "chat", "alwaysOn", "acceptAll", "acceptSelected", "rejectAll", "hide"] },
-  "home.hero": { Hero: ["badge", "line1", "line2", "description", "ctaWork", "ctaContact"] },
+  "home.hero": { Hero: ["kicker", "claim", "intro", "countdown", "ctaWork", "ctaContact"] },
   "home.about": { About: ["title", "p1", "p2", "p3", "funFactTitle", "funFactBody", "hobbiesTitle"] },
   "home.about.activity": { ActivityFeed: ["idleStatus", "codingNow", "gaming", "inGame", "listening"] },
   "home.about.currentlyReading": { CurrentlyReading: ["title", "progress"] },