feat: add global keyboard shortcuts for undo/redo and command palette

src/App.tsx

@@ -5,6 +5,7 @@ import { BoardList } from "@/components/boards/BoardList";
 import { BoardView } from "@/components/board/BoardView";
 import { CommandPalette } from "@/components/command-palette/CommandPalette";
 import { SettingsDialog } from "@/components/settings/SettingsDialog";
+import { useKeyboardShortcuts } from "@/hooks/useKeyboardShortcuts";
 
 export default function App() {
   const initialized = useAppStore((s) => s.initialized);
@@ -32,6 +33,8 @@ export default function App() {
     setSettingsOpen(true);
   }, []);
 
+  useKeyboardShortcuts();
+
   if (!initialized) {
     return (
       <div className="flex h-screen items-center justify-center bg-pylon-bg">