feat: improve book reviews, restore detailed privacy policy, fix header logo, add theme toggle, integrate boneyard-js

- Book reviews: add line-clamp for longer review text with expand/collapse per review
- Privacy policy: restore full detailed DSGVO-compliant fallback content
- Header (legal pages): change logo from 'dk' to 'dk0' in circle
- Header (main page): add ThemeToggle for dark/light mode switching
- Skeleton loading: integrate boneyard-js for ReadBooks, CurrentlyReading, Projects
- Add boneyard.config.json and bones/registry.ts placeholder

app/components/ReadBooks.tsx

@@ -5,7 +5,7 @@ import { BookCheck, Star, ChevronDown, ChevronUp } from "lucide-react";
 import { useEffect, useState } from "react";
 import { useLocale, useTranslations } from "next-intl";
 import Image from "next/image";
-import { Skeleton } from "./ui/Skeleton";
+import { Skeleton } from "boneyard-js/react";
 
 interface BookReview {
   id: string;
@@ -48,6 +48,7 @@ const ReadBooks = () => {
   const [reviews, setReviews] = useState<BookReview[]>([]);
   const [loading, setLoading] = useState(true);
   const [expanded, setExpanded] = useState(false);
+  const [expandedReviews, setExpandedReviews] = useState<Set<string>>(new Set());
 
   const INITIAL_SHOW = 3;
 
@@ -82,25 +83,7 @@ const ReadBooks = () => {
     fetchReviews();
   }, [locale]);
 
-  if (loading) {
-    return (
-      <div className="space-y-6">
-        {[1, 2].map((i) => (
-          <div key={i} className="flex flex-col sm:flex-row gap-4 items-start">
-            <Skeleton className="w-20 h-[7.5rem] sm:w-24 sm:h-32 rounded-lg shrink-0" />
-            <div className="flex-1 space-y-2 w-full">
-              <Skeleton className="h-5 w-1/2" />
-              <Skeleton className="h-4 w-1/3" />
-              <Skeleton className="h-3 w-1/4 pt-2" />
-              <Skeleton className="h-12 w-full pt-2" />
-            </div>
-          </div>
-        ))}
-      </div>
-    );
-  }
-
-  if (reviews.length === 0) {
+  if (reviews.length === 0 && !loading) {
     return (
       <div className="flex items-center gap-3 py-4 text-sm text-stone-400 dark:text-stone-500">
         <BookCheck size={16} className="shrink-0" />
@@ -113,7 +96,8 @@ const ReadBooks = () => {
   const hasMore = reviews.length > INITIAL_SHOW;
 
   return (
-    <div className="space-y-4">
+    <Skeleton name="read-books" loading={loading} animate="shimmer" transition>
+      <div className="space-y-4">
       {/* Header */}
       <div className="flex items-center gap-2 mb-4">
         <BookCheck size={18} className="text-stone-600 dark:text-stone-300 flex-shrink-0" />
@@ -198,9 +182,27 @@ const ReadBooks = () => {
 
               {/* Review Text (Optional) */}
               {review.review && (
-                <p className="text-sm text-stone-700 dark:text-stone-300 leading-relaxed italic">
-                  &ldquo;{stripHtml(review.review)}&rdquo;
-                </p>
+                <div className="relative">
+                  <p className={`text-sm text-stone-700 dark:text-stone-300 leading-relaxed italic ${!expandedReviews.has(review.id) ? 'line-clamp-3' : ''}`}>
+                    &ldquo;{stripHtml(review.review)}&rdquo;
+                  </p>
+                  {stripHtml(review.review).length > 100 && (
+                    <button
+                      onClick={(e) => {
+                        e.stopPropagation();
+                        setExpandedReviews(prev => {
+                          const next = new Set(prev);
+                          if (next.has(review.id)) next.delete(review.id);
+                          else next.add(review.id);
+                          return next;
+                        });
+                      }}
+                      className="text-xs text-liquid-sky hover:text-liquid-mint dark:text-liquid-sky dark:hover:text-liquid-mint font-medium mt-1 transition-colors"
+                    >
+                      {expandedReviews.has(review.id) ? t("collapseReview") : t("readMore")}
+                    </button>
+                  )}
+                </div>
               )}
 
               {/* Finished Date */}
@@ -240,8 +242,8 @@ const ReadBooks = () => {
         </motion.button>
       )}
 
-      
     </div>
+    </Skeleton>
   );
 };