#7213 image file extension fix

Author: tobiu

apps/portal/resources/data/blog.json

@@ -3,7 +3,7 @@
     "authorImage" : "author_TobiasUhlig.jpeg",
     "date"        : "Sep 17, 2025",
     "id"          : 70,
-    "image"       : "StateManagerForPerformance.jpg",
+    "image"       : "StateManagerForPerformance.png",
     "name"        : "Designing a State Manager for Performance: A Deep Dive into Hierarchical Reactivity",
     "provider"    : "Medium",
     "publisher"   : "",