add tasks for dresden, steglitz and bode-museum

public/app.js

@@ -63,6 +63,14 @@ function extractChapters() {
     }
 }
 
+// Prüfe ob alle Aufgaben eines Kapitels gelöst sind
+function isChapterCompleted(chapter) {
+    const chapterTasks = tasks.filter(task => task.chapter === chapter);
+    if (chapterTasks.length === 0) return false;
+    
+    return chapterTasks.every(task => task.isCorrect === true);
+}
+
 // Rendere Sidebar für alle Chapters
 function renderSidebar() {
     const sidebar = document.getElementById('sidebar');
@@ -86,12 +94,21 @@ function renderSidebar() {
 
     chapters.forEach(chapter => {
         const sidebarItem = document.createElement('div');
-        sidebarItem.className = `sidebar-item ${activeChapter === chapter ? 'active' : ''}`;
+        const isCompleted = isChapterCompleted(chapter);
+        let itemClasses = `sidebar-item ${activeChapter === chapter ? 'active' : ''}`;
+        if (isCompleted) {
+            itemClasses += ' completed';
+        }
+        sidebarItem.className = itemClasses;
         sidebarItem.onclick = () => switchChapter(chapter);
         
         const title = document.createElement('div');
         title.className = 'sidebar-item-title';
-        title.textContent = chapter;
+        let titleText = chapter;
+        if (isCompleted) {
+            titleText = '✓ ' + titleText;
+        }
+        title.textContent = titleText;
         sidebarItem.appendChild(title);
         
         sidebar.appendChild(sidebarItem);