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/cards.css

@@ -76,6 +76,87 @@ section {
     animation: cardEnter 0.25s ease-out both;
 }
 
+/* ── Card drag-and-drop reordering ── */
+
+.card-drag-handle {
+    position: absolute;
+    top: 4px;
+    left: 4px;
+    width: 18px;
+    height: 18px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    cursor: grab;
+    opacity: 0;
+    color: var(--text-secondary);
+    font-size: 10px;
+    letter-spacing: 1px;
+    line-height: 1;
+    border-radius: 3px;
+    transition: opacity 0.2s ease, background 0.15s ease;
+    z-index: 2;
+    touch-action: none;
+    user-select: none;
+}
+
+.card:hover > .card-drag-handle,
+.template-card:hover > .card-drag-handle {
+    opacity: 0.5;
+}
+
+.card-drag-handle:hover {
+    opacity: 1 !important;
+    background: var(--border-color);
+}
+
+.card-drag-handle:active {
+    cursor: grabbing;
+}
+
+/* Clone floating during drag */
+.card-drag-clone {
+    position: fixed;
+    z-index: 9999;
+    pointer-events: none;
+    opacity: 0.92;
+    transform: scale(1.03) rotate(0.8deg);
+    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
+    transition: none;
+    will-change: left, top;
+}
+
+/* Placeholder in grid */
+.card-drag-placeholder {
+    border: 2px dashed var(--primary-color);
+    border-radius: 8px;
+    background: rgba(33, 150, 243, 0.04);
+    min-height: 80px;
+    transition: none;
+}
+
+/* Suppress hover effects during drag */
+.cs-dragging .card,
+.cs-dragging .template-card {
+    transition: none !important;
+    transform: none !important;
+}
+
+.cs-dragging .card-drag-handle {
+    opacity: 0 !important;
+}
+
+/* Hide drag handles when filter is active */
+.cs-filtering .card-drag-handle {
+    display: none;
+}
+
+@media (prefers-reduced-motion: reduce) {
+    .card-drag-clone {
+        transform: none;
+    }
+}
+
 .card-tutorial-btn {
     position: absolute;
     bottom: 10px;