fix: Xgen Node

[CocoRoF]

This pull request improves the stability and performance of the AgentXgenNode component by refining how output ports are updated in response to changes in the streaming parameter. The main focus is on preventing unnecessary re-renders and ensuring the latest callback reference is used, which enhances compatibility in production environments.

Performance and Stability Improvements:

• Introduced a useRef (onOutputsUpdateRef) to always use the latest onOutputsUpdate callback, preventing stale closures and ensuring correct behavior when the callback changes. [1] [2]
• Optimized the dependency for output port recalculation: now only the streamingValue is used as a dependency in useMemo, reducing unnecessary recomputation and re-renders.
• Updated the useEffect for output updates to depend only on streamingValue and related variables, and to use the latest callback from onOutputsUpdateRef. Output updates are now only triggered when the actual output ID changes, preventing redundant updates.

Documentation Updates:

• Enhanced the component’s documentation to explain the use of useRef for callback reference stability and the rationale for the new dependency structure, clarifying production compatibility considerations.