Reset UI environment on episode control requests in mujoco_server.py

- Added functionality to reset the environment automatically when an episode control action is requested via the UI, allowing users to continue without manual resets.
- This enhancement improves user experience by streamlining the episode management process.

mujoco_server.py

@@ -580,6 +580,10 @@ def _signal_episode_control(action: str):
         "message": f"Episode {status_label} requested via UI",
         "timestamp": payload["timestamp"],
     })
+    # Reset UI environment so the user can continue without manual reset
+    with mujoco_lock:
+        if env is not None:
+            env.reset()
 
 
 def _consume_episode_control_flags():