diff --git a/web/index.html b/web/index.html
index 2e09514..7432a41 100644
--- a/web/index.html
+++ b/web/index.html
@@ -27,14 +27,15 @@
         { href: 'daily-bookmarks.css', id: 'dailyBookmarksCss', disabled: true }
       ];
       const jsFiles = [
-        'app.js',
-        'dashboard.js',
-        'settings.js',
-        'ai-debug.js',
-        'vendor/list.min.js',
-        'automation.js',
-        'daily-bookmarks.js',
-        'trade-fairs.js'
+        { src: 'app.js' },
+        { src: 'dashboard.js' },
+        { src: 'settings.js' },
+        { src: 'ai-debug.js' },
+        { src: 'vendor/list.min.js' },
+        { src: 'automation.js' },
+        { src: 'daily-bookmarks.js' },
+        // Optional: new bookmark subpage. If not yet deployed/cached, app must still boot.
+        { src: 'trade-fairs.js', optional: true }
       ];
 
       function withVersion(value) {
@@ -65,16 +66,51 @@
         });
       }
 
+      function normalizeScriptEntry(entry) {
+        if (typeof entry === 'string') {
+          return { src: entry, optional: false };
+        }
+        return {
+          src: entry && entry.src ? entry.src : '',
+          optional: Boolean(entry && entry.optional)
+        };
+      }
+
+      function showBootstrapError(message) {
+        document.body.classList.remove('auth-pending');
+        const loadingEl = document.getElementById('loading');
+        const errorEl = document.getElementById('error');
+        if (loadingEl) {
+          loadingEl.style.display = 'none';
+        }
+        if (errorEl) {
+          errorEl.style.display = 'block';
+          errorEl.textContent = message || 'Die Anwendung konnte nicht geladen werden.';
+        }
+      }
+
       function loadScriptsSequentially(list, index = 0) {
         return new Promise((resolve, reject) => {
           if (index >= list.length) {
             resolve();
             return;
           }
+          const entry = normalizeScriptEntry(list[index]);
+          if (!entry.src) {
+            loadScriptsSequentially(list, index + 1).then(resolve).catch(reject);
+            return;
+          }
           const script = document.createElement('script');
-          script.src = withVersion(list[index]);
+          script.src = withVersion(entry.src);
           script.onload = () => loadScriptsSequentially(list, index + 1).then(resolve).catch(reject);
-          script.onerror = reject;
+          script.onerror = () => {
+            if (entry.optional) {
+              console.warn('Optionales Script konnte nicht geladen werden:', entry.src);
+              loadScriptsSequentially(list, index + 1).then(resolve).catch(reject);
+              return;
+            }
+            reject(new Error(`Script konnte nicht geladen werden: ${entry.src}`));
+          };
           document.body.appendChild(script);
         });
       }
@@ -86,10 +122,14 @@
             redirectToLogin();
             return;
           }
+          if (!res.ok) {
+            throw new Error(`Session-Check fehlgeschlagen (${res.status})`);
+          }
           loadStyles();
           await loadScriptsSequentially(jsFiles);
-        } catch (_error) {
-          redirectToLogin();
+        } catch (error) {
+          console.error('Bootstrap fehlgeschlagen:', error);
+          showBootstrapError('Fehler beim Laden der Anwendung. Bitte Seite neu laden.');
         }
       }