Add dashboard crosslinks and card drag-and-drop reordering

Dashboard cards (targets, auto-start, profiles) are now clickable,
navigating to the full entity card on the appropriate tab. Card
sections support drag-and-drop reordering via grip handles with
localStorage persistence. Fix crosslink navigation scoping to avoid
matching dashboard cards, and fix highlight race on rapid clicks.

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

server/src/wled_controller/static/css/dashboard.css

@@ -88,6 +88,11 @@
     box-shadow: 0 2px 8px var(--shadow-color);
 }
 
+.dashboard-card-link:hover {
+    border-color: var(--primary-color);
+    box-shadow: 0 4px 12px var(--shadow-color);
+}
+
 .dashboard-target-info {
     display: flex;
     align-items: center;
@@ -112,6 +117,10 @@
     gap: 4px;
 }
 
+.dashboard-card-link {
+    cursor: pointer;
+}
+
 .dashboard-target-name .health-dot {
     margin-right: 0;
     flex-shrink: 0;