fix(desktop): kill the node sidecar before self-update restart (#61)

app.restart() may not run the RunEvent::Exit handler, so the sidecar server could
linger and hold port 34115 — breaking the relaunched (updated) instance's own
server. Kill it explicitly before restarting.

Author: ApocDev

app/src-tauri/src/lib.rs

@@ -176,6 +176,15 @@ async fn updater_install(
         )
         .await
         .map_err(|e| e.to_string())?;
+    // Kill the node sidecar before relaunching; restart() may not run the Exit
+    // handler, and a lingering server would hold port 34115 and break the new
+    // instance's own sidecar.
+    #[cfg(not(debug_assertions))]
+    if let Some(state) = app.try_state::<ServerChild>() {
+        if let Some(child) = state.0.lock().unwrap().take() {
+            let _ = child.kill();
+        }
+    }
     app.restart()
 }