fix: add des on iteration node

[HiChen404]

Description

Fixes #5114

Type of Change

• Improvement, including but not limited to code refactoring, performance optimization, and UI/UX improvement

How Has This Been Tested?

Suggested Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods
• optional I have made corresponding changes to the documentation
• optional I have added tests that prove my fix is effective or that my feature works
• optional New and existing unit tests pass locally with my changes

[crazywoola]

Emm, actually it is in the bottom of the container.

[HiChen404]

Sorry I didn't get it，
I've modified the description style of the iteration node to maintain consistency with other nodes.
What else needs to be changed?

[crazywoola]

@zxhlyh
@HiChen404 Can you dm me on wechat @HiChen404 crazyphage. I will invite a group chat regarding this one.