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

src/App.tsx

@@ -3,6 +3,7 @@ import { useAppStore } from "@/stores/app-store";
 import { AppShell } from "@/components/layout/AppShell";
 import { BoardList } from "@/components/boards/BoardList";
 import { BoardView } from "@/components/board/BoardView";
+import { CommandPalette } from "@/components/command-palette/CommandPalette";
 
 export default function App() {
   const initialized = useAppStore((s) => s.initialized);
@@ -24,8 +25,11 @@ export default function App() {
   }
 
   return (
-    <AppShell>
-      {view.type === "board-list" ? <BoardList /> : <BoardView />}
-    </AppShell>
+    <>
+      <AppShell>
+        {view.type === "board-list" ? <BoardList /> : <BoardView />}
+      </AppShell>
+      <CommandPalette onOpenSettings={() => {}} />
+    </>
   );
 }