⛷ Optimize validating logic

- [ ] Currently validating in S2ibuilder is too simple. Optimize the validating logic to prevent user misoperations

- [ ] Add logic to prevent user update some values.

Start by locating the S2ibuilder validation entry point and reviewing its current checks. Identify which user operations and value updates must be rejected; the work is done when those invalid operations are prevented and the validation behavior is covered by the project's relevant tests.

Written by the indexing model from the issue text.