feat: add search window (NIP-50) (#181)

* feat: add search window
* chore: improve search ui

apps/desktop2/src/routes/$account.tsx

@@ -1,4 +1,4 @@
-import { ComposeFilledIcon, PlusIcon } from "@lume/icons";
+import { ComposeFilledIcon, PlusIcon, SearchIcon } from "@lume/icons";
 import { Outlet, createFileRoute, useNavigate } from "@tanstack/react-router";
 import { cn } from "@lume/utils";
 import { Accounts } from "@/components/accounts";
@@ -34,6 +34,13 @@ function App() {
           >
             <PlusIcon className="size-5" />
           </button>
+          <button
+            type="button"
+            onClick={() => ark.open_search()}
+            className="inline-flex size-8 items-center justify-center rounded-full bg-neutral-200 text-neutral-800 hover:bg-neutral-400 dark:bg-neutral-800 dark:text-neutral-200 dark:hover:bg-neutral-600"
+          >
+            <SearchIcon className="size-5" />
+          </button>
         </div>
         <div className="flex items-center gap-3">
           <button