### What problem does this PR solve?
Feat: Combine Select and LlmSettingFieldItems into LLMSelect. #3221
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Feat: Use shadcn-ui to build GenerateForm. #3221
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Feat: Wrap DynamicVariableForm with Collapsible. #3221
### Type of change
- [x] New Feature (non-breaking change which adds functionality)