feat: Add safe mounting for display set viewers to enhance viewer initialization

Co-authored-by: Copilot <copilot@github.com>

atlas/templates/atlas/partials/_case_displaysets.html

@@ -96,6 +96,33 @@
         if (!window.__displaysetPartialInitDone) {
             window.__displaysetPartialInitDone = true;
 
+            if (typeof window.mountDisplaysetViewersSafely !== 'function') {
+                window.mountDisplaysetViewersSafely = async function () {
+                    try {
+                        await new Promise(function (resolve) {
+                            requestAnimationFrame(function () {
+                                requestAnimationFrame(resolve);
+                            });
+                        });
+
+                        if (typeof window.mountDicomViewersSafely === 'function') {
+                            await window.mountDicomViewersSafely();
+                        } else if (typeof window.mountDicomViewers === 'function') {
+                            window.mountDicomViewers();
+                        }
+
+                        requestAnimationFrame(function () {
+                            try { window.dispatchEvent(new Event('resize')); } catch (e) {}
+                            if (typeof window.resizeDicomViewers === 'function') {
+                                try { window.resizeDicomViewers(); } catch (e) {}
+                            }
+                        });
+                    } catch (e) {
+                        console.warn('displayset viewer mount failed', e);
+                    }
+                };
+            }
+
             if (typeof window.loadDisplaysetModal !== 'function') {
                 window.loadDisplaysetModal = async function (url, dsId) {
                     if (!url && dsId) url = '/atlas/' + dsId + '/display_sets/modal';
@@ -118,6 +145,7 @@
                         }
 
                         bootstrap.Modal.getOrCreateInstance(modalEl).show();
+                        await window.mountDisplaysetViewersSafely();
                     } catch (error) {
                         console.error('Error loading display set details:', error);
                         modalBody.innerHTML = '<p>Failed to load display set.</p>';
@@ -164,6 +192,7 @@
                         rightEl.innerHTML = tmp.innerHTML;
 
                         bootstrap.Modal.getOrCreateInstance(fullModalEl).show();
+                        await window.mountDisplaysetViewersSafely();
                     } catch (error) {
                         console.error('Error loading fullscreen display set:', error);
                         leftEl.innerHTML = '<p style="color:#fff; padding:1rem;">Failed to load viewer</p>';