[codex] Improve desktop startup shell loading

desktop/src-tauri/src/lib.rs

@@ -300,9 +300,13 @@ pub fn run() {
             resolve_persisted_identity(&app_handle, &state)
                 .map_err(|e| -> Box<dyn std::error::Error> { e.into() })?;
 
-            if let Err(error) = restore_managed_agents_on_launch(&app_handle) {
-                eprintln!("sprout-desktop: failed to restore managed agents: {error}");
-            }
+            // Keep launch-time agent restoration off the synchronous setup path
+            // so the frontend can mount and reveal the window promptly.
+            tauri::async_runtime::spawn_blocking(move || {
+                if let Err(error) = restore_managed_agents_on_launch(&app_handle) {
+                    eprintln!("sprout-desktop: failed to restore managed agents: {error}");
+                }
+            });
 
             Ok(())
         })

desktop/src/app/App.tsx

@@ -1,11 +1,11 @@
 import { getCurrentWindow } from "@tauri-apps/api/window";
-import { useEffect } from "react";
+import { useLayoutEffect } from "react";
 
 import { AppShell } from "@/app/AppShell";
 
 export function App() {
-  useEffect(() => {
-    getCurrentWindow().show();
+  useLayoutEffect(() => {
+    void getCurrentWindow().show();
   }, []);
 
   return <AppShell />;