fix: sync custom server config saves immediately

apps/desktop/src-tauri/src/commands/space.rs

@@ -6,7 +6,10 @@
 //! built-in fallback. The desktop UI tracks which space the user is
 //! viewing in its own Zustand store (frontend-only state).
 
-use mcpmux_core::{validate_workspace_root, Space, SpaceBaseDir, WorkspaceRootValidation};
+use mcpmux_core::{
+    application::UserSpaceSyncService, validate_workspace_root, Space, SpaceBaseDir,
+    WorkspaceRootValidation,
+};
 use std::sync::Arc;
 use tauri::{AppHandle, State};
 use tokio::sync::RwLock;
@@ -193,7 +196,28 @@ pub async fn save_space_config(
     serde_json::from_str::<serde_json::Value>(&content)
         .map_err(|e| format!("Invalid JSON: {}", e))?;
 
-    std::fs::write(&config_path, content).map_err(|e| format!("Failed to write config file: {}", e))
+    std::fs::write(&config_path, content)
+        .map_err(|e| format!("Failed to write config file: {}", e))?;
+
+    // Do not rely solely on the debounced file watcher. The UI reloads immediately
+    // after this command returns, so sync the just-saved file into InstalledServer
+    // records synchronously to avoid stale/missing custom-server state.
+    let sync_service = UserSpaceSyncService::new(state.installed_server_repository.clone());
+    let sync_result = sync_service
+        .sync_from_file(&space_id, &config_path)
+        .await
+        .map_err(|e| format!("Failed to sync custom server config: {}", e))?;
+
+    if sync_result.has_changes() {
+        info!(
+            "[save_space_config] Synced custom server config: {} added, {} updated, {} removed",
+            sync_result.added.len(),
+            sync_result.updated.len(),
+            sync_result.removed.len()
+        );
+    }
+
+    Ok(())
 }
 
 /// Remove a server from the space configuration file