Fix: use change event instead of input for spinner buttons

webapp/path_navigator.html

@@ -752,8 +752,8 @@
             }
         });
         
-        // Also trigger on spinner button clicks
-        document.getElementById("fundamentalInput").addEventListener("input", () => {
+        // Trigger on spinner button clicks (change event fires on blur after value change)
+        document.getElementById("fundamentalInput").addEventListener("change", () => {
             setFundamental();
         });