Move MonacoUSA logo from global overlay to dashboard nav toggle

Remove global fixed-position logo from app.vue and integrate it as the navigation drawer toggle button in the dashboard layout's app bar. This improves the layout by eliminating overlay positioning issues while maintaining logo visibility and functionality.

layouts/dashboard.vue

@@ -90,7 +90,18 @@
     </v-navigation-drawer>
     
     <v-app-bar app color="primary" elevation="2">
-      <v-app-bar-nav-icon @click="drawer = !drawer" color="white" />
+      <!-- MonacoUSA Logo as Navigation Toggle -->
+      <v-btn
+        variant="text"
+        @click="drawer = !drawer"
+        class="mr-2"
+      >
+        <MonacoUSALogo 
+          size="small" 
+          variant="white"
+          clickable
+        />
+      </v-btn>
       
       <v-toolbar-title class="text-white font-weight-bold">
         MonacoUSA Portal