fix: reposition ReactQueryDevtools button to middle-right

The button was blocking UI elements at the bottom-right corner. This CSS
override moves it to the middle-right position while keeping the same
horizontal placement, providing better UI visibility and interaction.

web/src/index.css

@@ -246,3 +246,9 @@ html[data-theme="dark"] .shiki span {
 .animate-bounce-in {
   animation: bounce-in 0.3s ease-out;
 }
+
+/* ReactQueryDevtools button - move to middle-right to avoid blocking UI */
+.tsqd-open-btn-container {
+  bottom: 50% !important;
+  transform: translateY(50%);
+}