fix: remove header logo visual effects

frontend/src/app/app.component.ts

@@ -89,8 +89,7 @@ import { MatButtonModule } from '@angular/material/button';
       position: sticky;
       top: 0;
       z-index: 20;
-      backdrop-filter: blur(16px);
-      background: rgba(250, 245, 238, 0.9);
+      background: #faf5ee;
       border-bottom: 1px solid var(--azionelab-border);
     }
 
@@ -108,6 +107,13 @@ import { MatButtonModule } from '@angular/material/button';
       align-items: center;
       justify-content: flex-start;
       flex: 0 0 auto;
+      background: transparent;
+      box-shadow: none;
+      filter: none;
+      opacity: 1;
+      mix-blend-mode: normal;
+      backdrop-filter: none;
+      -webkit-backdrop-filter: none;
       color: inherit;
       text-decoration: none;
     }
@@ -117,7 +123,13 @@ import { MatButtonModule } from '@angular/material/button';
       height: auto;
       max-height: 76px;
       display: block;
-      box-shadow: 0 16px 32px rgba(111, 40, 33, 0.12);
+      background: transparent;
+      box-shadow: none;
+      filter: none;
+      opacity: 1;
+      mix-blend-mode: normal;
+      mask: none;
+      -webkit-mask: none;
     }
 
     .main-nav {