fix: Expand analytics sections on mode switch

Sidebar sections are collapsed by default on DOMContentLoaded. When
switching to analytics mode, expand all its sections so the dashboard
content is visible immediately.

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

templates/index.html

@@ -3866,6 +3866,8 @@
 
             // Initialize/destroy Analytics mode
             if (mode === 'analytics') {
+                // Expand all analytics sections (sidebar sections default to collapsed)
+                document.querySelectorAll('#analyticsMode .section.collapsed').forEach(s => s.classList.remove('collapsed'));
                 if (typeof Analytics !== 'undefined') Analytics.init();
             } else {
                 if (typeof Analytics !== 'undefined' && Analytics.destroy) Analytics.destroy();