Add card color system with wrapCard helper and reset support

Introduce localStorage-backed card color assignment for all card types
with a reusable wrapCard() helper that provides consistent card shell
structure (top actions, bottom actions with color picker). Move color
picker from top-right to bottom-right action bar. Add color reset
button to clear card color back to default.

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

server/src/wled_controller/static/css/cards.css

@@ -204,6 +204,26 @@ body.cs-drag-active .card-drag-handle {
     position: static;
 }
 
+.card-actions .color-picker-wrapper,
+.template-card-actions .color-picker-wrapper {
+    display: flex;
+    align-items: center;
+    margin-left: auto;
+}
+
+.card-actions .color-picker-popover,
+.template-card-actions .color-picker-popover {
+    top: auto;
+    bottom: calc(100% + 8px);
+    left: auto;
+    right: 0;
+}
+
+.card.cp-elevated,
+.template-card.cp-elevated {
+    z-index: 10;
+}
+
 .card-autostart-btn {
     background: none;
     border: none;