feat: plakat redesign phase 4 (chat window, contact, footer, cleanup) (#77)

- AI chat moves into a window/sheet, opened from a new speech-bubble card on
  the desk; it now respects the chatbot consent and asks before sending
  anything to n8n (previously it ignored the consent)
- Contact as red poster section with big mail address and the form on a paper
  card; validation errors are finally shown inline (aria-invalid, role=alert)
- Footer as ink strip with dk0 wordmark, legal links and a button to reopen
  the privacy settings
- "About me" in the header opens the about window on the home page
- Remove the old About section and its parts (BentoChat, ActivityFeed,
  CurrentlyReading, ReadBooks), the unused ChatWidget, Projects and BentoGrid,
  their tests, wrappers, loaders, types and texts
- scripts/directus-cleanup-redesign.mjs: dry run by default, --apply archives
  hobbies, tech stack categories and old content pages and deletes four
  unused message overrides after a full JSON backup; run only after the
  redesign is live on production

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

app/components/tisch/ObjectFace.tsx

@@ -85,6 +85,15 @@ export default function ObjectFace({ obj, labels }: ObjectFaceProps) {
         </div>
       );
 
+    case "chat":
+      return (
+        <div className="flex h-full w-full flex-col justify-between rounded-[22px_22px_22px_6px] border-2 border-ink bg-ink p-4 text-paper">
+          <span className="font-mono text-xs uppercase tracking-wide text-signal">KI · n8n</span>
+          <span className="font-display text-[1.7rem] font-extrabold leading-[0.95] tracking-[-0.03em]">{labels.chatCard}</span>
+          <span className="font-mono text-xs opacity-70">{labels.chatCardHint} ↗</span>
+        </div>
+      );
+
     case "sticker":
       return (
         <div className="grid h-full w-full place-items-center rounded-full border-2 border-ink bg-signal p-6 text-center font-display text-xl font-extrabold leading-[0.98] tracking-[-0.02em] text-ink">