style(xtream): update icon colors to improve visibility and consistency

src/app/xtream-tauri/navigation/navigation.component.scss

@@ -150,7 +150,6 @@ mat-icon {
                 width: 20px;
                 height: 20px;
                 margin: 0;
-                color: rgba(255, 255, 255, 0.7);
                 transition: all 0.2s ease;
             }
 
@@ -158,7 +157,6 @@ mat-icon {
                 background: rgba(255, 255, 255, 0.15);
                 
                 mat-icon {
-                    color: rgba(255, 255, 255, 0.95);
                     transform: scale(1.1);
                 }
             }
@@ -185,7 +183,7 @@ mat-icon {
         text-transform: uppercase;
         letter-spacing: 0.5px;
         font-weight: 500;
-        color: rgba(255, 255, 255, 0.5);
+        opacity: .7;
     }
 
     .mat-nav-list {