fix: ticket preview popup wrong position and persists after interactions

- position:fixed popup was adding window.scrollX/scrollY to viewport coords
  from getBoundingClientRect(), making it appear far below link when scrolled
- Off-screen check compared against innerHeight + scrollY instead of innerHeight
- Added clamp to prevent negative coords (popup clipped off top/left edge)
- Hide preview on scroll, modal open, and pagination clicks (capture phase)
  so stale popup doesn't linger after user navigates away

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

assets/js/dashboard.js

@@ -1332,21 +1332,25 @@ function showTicketPreview(event) {
             <div class="preview-footer">Created by ${lt.escHtml(createdBy)}</div>
         `;
 
-        // Position the preview
+        // Position the preview — element is position:fixed so coords are
+        // viewport-relative; getBoundingClientRect() already returns viewport coords,
+        // do NOT add scrollX/scrollY
         const rect = link.getBoundingClientRect();
         const previewWidth = 320;
         const previewHeight = 200;
 
-        let left = rect.left + window.scrollX;
-        let top = rect.bottom + window.scrollY + 5;
+        let left = rect.left;
+        let top = rect.bottom + 5;
 
         // Adjust if going off-screen
         if (left + previewWidth > window.innerWidth) {
             left = window.innerWidth - previewWidth - 20;
         }
-        if (top + previewHeight > window.innerHeight + window.scrollY) {
-            top = rect.top + window.scrollY - previewHeight - 5;
+        if (top + previewHeight > window.innerHeight) {
+            top = rect.top - previewHeight - 5;
         }
+        if (left < 0) left = 4;
+        if (top < 0)  top = 4;
 
         currentPreview.style.left = left + 'px';
         currentPreview.style.top = top + 'px';
@@ -1374,6 +1378,20 @@ document.addEventListener('DOMContentLoaded', function() {
     }
 });
 
+// Hide preview when a modal opens, user scrolls, or page is about to navigate
+document.addEventListener('click', function(e) {
+    if (e.target.closest('[data-modal-open], [data-action="open-advanced-search"], .lt-pagination a, .lt-pagination button')) {
+        hideTicketPreview();
+        if (currentPreview) currentPreview.classList.add('is-hidden');
+    }
+}, true);
+document.addEventListener('scroll', function() {
+    if (currentPreview && !currentPreview.classList.contains('is-hidden')) {
+        currentPreview.classList.add('is-hidden');
+        if (previewTimeout) { clearTimeout(previewTimeout); previewTimeout = null; }
+    }
+}, { passive: true });
+
 /**
  * Toggle export dropdown menu
  */