Save the changes for workflow settings

[Tishasoumya-02]

Pending to be implemented

[devrajpardhi04]

Actually, initially I misunderstood this issue. After investigating further, I found that the problem is related to guard and Expression objects used in transitions.

When making changes to:

• workflow title or description, or
• state title or description,

everything worked correctly. However, when updating a transition, the changes were not saved and the backend returned a 500 error.

After debugging, I found that the backend was returning guard-related fields containing Expression objects in the API response. Since Expression objects are not JSON serializable, the response failed during json.dumps(), which caused the 500 error.

I have now fixed this by ensuring that guard and expression fields are converted into JSON-safe values before returning the response. After this change, transition updates work correctly and persist as expected.

[devrajpardhi04]

@Tishasoumya-02 please review this PR and close this issue. Thank You!