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

- 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>

messages/en.json

@@ -67,6 +67,8 @@
       "bookLabel": "Reading now",
       "bookFallback": "To the library",
       "photoCaption": "That's me.",
+      "chatCard": "Ask me something.",
+      "chatCardHint": "Open AI chat",
       "sticker": "Runs on my own servers."
     },
     "windows": {
@@ -127,6 +129,17 @@
           }
         }
       },
+      "chat": {
+        "title": "ask me · AI",
+        "welcome": "Hi! Ask me anything about Dennis, his projects or his setup.",
+        "consent": "The chat runs through an AI service in my n8n. Your messages are processed and briefly stored for that. Nothing is sent until you agree.",
+        "allow": "Allow chat",
+        "placeholder": "Your question …",
+        "send": "Send",
+        "error": "No connection right now. Try again in a moment.",
+        "thinking": "Writing a reply",
+        "note": "Answers come from an AI and can be wrong."
+      },
       "contact": {
         "title": "contact",
         "body": "For projects, questions about my setup or just because. I usually reply within a day or two.",
@@ -135,63 +148,9 @@
         "form": "To the form"
       }
     },
-    "about": {
-      "title": "Behind the Code",
-      "p1": "Ever since I set up my first home server, I've been hooked on infrastructure. Currently studying in Osnabrück, I split my time between developing modern web apps with Next.js and building mobile experiences with Flutter.",
-      "p2": "For me, it doesn't stop at the code. I genuinely enjoy managing my own Docker clusters, optimizing CI/CD pipelines, and making sure everything is stable and secure. DevOps isn't just a part of my job – it's how I think about building things.",
-      "p3": "When the servers are running smoothly, you'll find me jogging through the city, gaming, or tinkering with new automation workflows in n8n.",
-      "funFactTitle": "Hardcore Analog",
-      "funFactBody": "Despite my love for automation and the cloud, my most important ideas are still born on paper with a fountain pen. It's my way of staying grounded.",
-      "techStackTitle": "My Tech Stack",
-      "hobbiesTitle": "When I'm Not Coding",
-      "techStack": {
-        "categories": {
-          "frontendMobile": "Frontend & Mobile",
-          "backendDevops": "Backend & DevOps",
-          "toolsAutomation": "Tools & Automation",
-          "securityAdmin": "Security & Admin"
-        },
-        "items": {
-          "selfHostedServices": "Self-hosted services"
-        }
-      },
-      "hobbies": {
-        "selfHosting": "Self-Hosting & DevOps",
-        "gaming": "Gaming",
-        "gameServers": "Setting up game servers",
-        "jogging": "Jogging to clear my mind and stay active"
-      },
-      "currentlyReading": {
-        "title": "Currently Reading",
-        "progress": "Progress"
-      },
-      "readBooks": {
-        "title": "Read",
-        "finishedAt": "Finished",
-        "showMore": "{count} more",
-        "showLess": "Show less",
-        "readMore": "Read more",
-        "collapseReview": "Show less",
-        "empty": "Books finished in Hardcover will appear here automatically."
-      },
-      "activity": {
-        "idleStatus": "System Idle / Mind Active",
-        "codingNow": "Coding Now",
-        "gaming": "Gaming",
-        "listening": "Listening",
-        "inGame": "In Game"
-      }
-    },
-    "projects": {
-      "title": "Selected Work",
-      "subtitle": "Projects that pushed my boundaries.",
-      "featured": "Featured",
-      "viewAll": "View Archive",
-      "noProjects": "No projects yet."
-    },
     "contact": {
-      "title": "Contact Me",
-      "subtitle": "Interested in working together or have questions about my projects? Feel free to reach out!",
+      "title": "Write me.",
+      "subtitle": "For projects, questions about my setup or just because. I usually reply within a day or two.",
       "getInTouch": "Get In Touch",
       "getInTouchBody": "I'm always available to discuss new opportunities, interesting projects, or simply chat about technology and innovation.",
       "info": {
@@ -251,13 +210,13 @@
     }
   },
   "footer": {
-    "role": "Software Engineer",
-    "madeIn": "Made in Germany",
+    "role": "IT & self-hosting",
+    "madeIn": "self-hosted in Germany",
     "legalNotice": "Legal notice",
     "privacyPolicy": "Privacy policy",
     "privacySettings": "Privacy settings",
     "privacySettingsTitle": "Show privacy settings banner again",
-    "builtWith": "Built with",
+    "builtWith": "Built with Next.js and Directus, running on my own servers.",
     "aiDisclaimer": "Some content on this site may be AI-assisted.",
     "backToTop": "Back to top",
     "systemsOnline": "Systems Online"
@@ -277,21 +236,5 @@
     "subtitle": "Books that shaped my mindset and expanded my horizons.",
     "backHome": "Back Home",
     "empty": "No books yet."
-  },
-  "about": {
-    "status": "Status",
-    "aiAssistant": "AI Assistant",
-    "library": "Library",
-    "viewAll": "View All",
-    "myGear": "My Gear",
-    "gearMain": "Main",
-    "gearPC": "PC",
-    "gearServer": "Server",
-    "gearOS": "OS",
-    "curiosity": "Curiosity beyond software engineering.",
-    "connect": "Connect",
-    "email": "Email",
-    "code": "Code",
-    "professional": "Professional"
   }
 }