feat: add command palette with cross-board search and actions

src/components/board/BoardView.tsx

@@ -41,6 +41,20 @@ export function BoardView() {
   const [newColumnTitle, setNewColumnTitle] = useState("");
   const inputRef = useRef<HTMLInputElement>(null);
 
+  // Listen for custom event to open card detail from command palette
+  useEffect(() => {
+    function handleOpenCard(e: Event) {
+      const detail = (e as CustomEvent<{ cardId: string }>).detail;
+      if (detail?.cardId) {
+        setSelectedCardId(detail.cardId);
+      }
+    }
+    document.addEventListener("open-card-detail", handleOpenCard);
+    return () => {
+      document.removeEventListener("open-card-detail", handleOpenCard);
+    };
+  }, []);
+
   // Drag state
   const [activeId, setActiveId] = useState<string | null>(null);
   const [activeType, setActiveType] = useState<"card" | "column" | null>(null);