fix: prevent double context menu on recent files right-click

stopPropagation prevents the event from bubbling to the upload-view
handler which was showing a second context menu.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

renderer/app.js

@@ -2135,6 +2135,7 @@ function setupListeners() {
     const tr = e.target.closest('.recent-file-row');
     if (!tr) return;
     e.preventDefault();
+    e.stopPropagation();
     const id = parseInt(tr.dataset.order, 10);
     if (!selectedRecentIds.has(id)) {
       selectedRecentIds.clear();