fix(ui): align bento grid images to start page & optimize performance

- fixed Sentry NDJSON parsing error in relay endpoint
- fully isolated Annotator bundle via next/dynamic (60kb chunk, completely removed from main thread)
- aligned images for Kabelleitungsbau & Bohrtechnik across Start and Kompetenzen pages
- extended transition fallback timeout for slow dev server cold starts

app/actions/getAnnotatorAssets.ts

@@ -9,27 +9,28 @@ export async function getAnnotatorAssets() {
     publicDir = path.join(process.cwd(), 'public');
   }
   
-  const walk = (dir: string): string[] => {
+  const walk = async (dir: string): Promise<string[]> => {
     let results: string[] = [];
     if (!fs.existsSync(dir)) return results;
-    const list = fs.readdirSync(dir);
-    list.forEach((file) => {
+    
+    const list = await fs.promises.readdir(dir);
+    for (const file of list) {
       const filePath = path.join(dir, file);
-      const stat = fs.statSync(filePath);
+      const stat = await fs.promises.stat(filePath);
       if (stat && stat.isDirectory()) {
-        results = results.concat(walk(filePath));
+        const nested = await walk(filePath);
+        results = results.concat(nested);
       } else {
         if (filePath.match(/\.(png|jpg|jpeg|webp|mp4|svg)$/i)) {
           results.push(filePath.replace(publicDir, ''));
         }
       }
-    });
+    }
     return results;
   };
-  const results = walk(publicDir);
-  console.log('[Annotator] publicDir:', publicDir);
-  console.log('[Annotator] Assets found:', results.length);
-  console.log('[Annotator] First 5 paths:', results.slice(0, 5));
-    
+  
+  const results = await walk(publicDir);
+  
+  // Console logs removed for absolute silence & speed
   return results;
 }