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">

src/hooks/useKeyboardShortcuts.ts

@@ -0,0 +1,57 @@
+import { useEffect } from "react";
+import { useBoardStore } from "@/stores/board-store";
+
+function isInputFocused(): boolean {
+  const el = document.activeElement;
+  if (!el) return false;
+  const tag = el.tagName.toLowerCase();
+  return (
+    tag === "input" ||
+    tag === "textarea" ||
+    (el as HTMLElement).isContentEditable
+  );
+}
+
+export function useKeyboardShortcuts(): void {
+  useEffect(() => {
+    function handleKeyDown(e: KeyboardEvent) {
+      const ctrl = e.ctrlKey || e.metaKey;
+
+      // Ctrl+K: open command palette (always works, even in inputs)
+      if (ctrl && e.key === "k") {
+        e.preventDefault();
+        document.dispatchEvent(new CustomEvent("open-command-palette"));
+        return;
+      }
+
+      // Skip remaining shortcuts when an input is focused
+      if (isInputFocused()) return;
+
+      // Ctrl+Shift+Z: redo
+      if (ctrl && e.shiftKey && e.key === "Z") {
+        e.preventDefault();
+        useBoardStore.temporal.getState().redo();
+        return;
+      }
+
+      // Ctrl+Z: undo
+      if (ctrl && e.key === "z") {
+        e.preventDefault();
+        useBoardStore.temporal.getState().undo();
+        return;
+      }
+
+      // Escape: close any open modal/dialog
+      // Note: Radix dialogs handle their own Escape, but this covers custom modals
+      if (e.key === "Escape") {
+        document.dispatchEvent(new CustomEvent("close-all-modals"));
+        return;
+      }
+    }
+
+    document.addEventListener("keydown", handleKeyDown);
+    return () => {
+      document.removeEventListener("keydown", handleKeyDown);
+    };
+  }, []);
+}