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/test/page.tsx

@@ -1,7 +0,0 @@
-export default function TestPage() {
-  return (
-    <div>
-      <h1>TEST PAGE WORKS</h1>
-    </div>
-  );
-}