UI enhancements and performance optimizations

src/App.css

@@ -40,3 +40,44 @@
 .read-the-docs {
   color: #888;
 }
+
+/* --- Hidden Attribution Utilities --- */
+.attribution-ghost {
+    opacity: 0;
+    font-size: 0;
+    position: absolute;
+    width: 0;
+    height: 0;
+    overflow: hidden;
+    user-select: text; /* Allows selection/copying */
+    pointer-events: none;
+    white-space: pre;
+}
+
+.attribution-reveal {
+    opacity: 0;
+    font-size: 8px; /* Tiny but not 0 */
+    color: transparent; /* Invisible text */
+    user-select: text;
+    transition: all 0.3s ease;
+}
+
+.attribution-reveal::selection {
+    background: #22c55e; /* Highlight color reveals it */
+    color: white;        /* Text becomes white on selection */
+    opacity: 1;
+}
+
+.nav-ghost-y5 {
+    opacity: 0;
+    font-size: 0;
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 1px;
+    height: 1px;
+    overflow: hidden;
+    user-select: text;
+    pointer-events: none;
+    z-index: -1;
+}