Prevent compare results from closing when selecting a school

- Added stopPropagation to result item click handler
- Window now stays open when adding schools to comparison
- Only closes when clicking outside or using close button/ESC

frontend/app.js

@@ -1226,7 +1226,8 @@ function setupEventListeners() {
       elements.compareResults
         .querySelectorAll(".compare-result-item")
         .forEach((item) => {
-          item.addEventListener("click", () => {
+          item.addEventListener("click", (e) => {
+            e.stopPropagation(); // Prevent click-outside handler from closing results
             const urn = parseInt(item.dataset.urn);
             const school = data.schools.find((s) => s.urn === urn);
             if (school) {