fix(shutdown): stop instances before app exit

Prevent desktop wrappers from SIGKILLing the CLI during shutdown, which could orphan OpenCode workspace processes. Shut down workspaces earlier/in parallel and increase the quit grace period.

packages/tauri-app/src-tauri/src/cli_manager.rs

@@ -34,6 +34,8 @@ fn workspace_root() -> Option<PathBuf> {
 
 const SESSION_COOKIE_NAME: &str = "codenomad_session";
 
+const CLI_STOP_GRACE_SECS: u64 = 30;
+
 fn navigate_main(app: &AppHandle, url: &str) {
     if let Some(win) = app.webview_windows().get("main") {
         let mut display = url.to_string();
@@ -290,7 +292,7 @@ impl CliProcessManager {
                 match child.try_wait() {
                     Ok(Some(_)) => break,
                     Ok(None) => {
-                        if start.elapsed() > Duration::from_secs(4) {
+                        if start.elapsed() > Duration::from_secs(CLI_STOP_GRACE_SECS) {
                             #[cfg(unix)]
                             unsafe {
                                 libc::kill(child.id() as i32, libc::SIGKILL);