CSS class migrations: stat-card cursor, view toggle, bulk actions visibility

- Replace stat-card cursor:pointer inline style with CSS rule
- Convert view toggle (table/card) to use .is-hidden CSS class
- Convert bulk-actions and export-dropdown to use .is-visible class
- Add .is-hidden/.is-visible utility rules to dashboard.css
- Remove duplicate lt.keys.initDefaults() call from dashboard.js
- Remove redundant setTimeout from view mode restore
- Add lt.keys.initDefaults() to dashboard.js (was missing entirely)

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

assets/css/dashboard.css

@@ -1413,6 +1413,11 @@ h1 {
 .loading-overlay--hiding { opacity: 0; }
 .has-overlay { position: relative; }
 
+/* Visibility utilities — !important required to override HTML inline style="display:none" */
+.is-hidden { display: none !important; }
+.bulk-actions-inline.is-visible { display: flex !important; }
+.export-dropdown.is-visible { display: inline-block !important; }
+
 .loading-overlay .loading-text {
     margin-top: 1rem;
     animation: blink-cursor 1s step-end infinite;
@@ -4580,6 +4585,7 @@ tr:hover .quick-actions {
     transition: border-color 0.2s ease, transform 0.15s ease;
     position: relative;
     overflow: hidden;
+    cursor: pointer;
 }
 
 /* Corner accent */