### What problem does this PR solve?

replace dataset icon

Issue link: #306 

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

feat: add loading to ChatContainer and set font family to inter and add tooltip to Form.Item and download documents on the document list page (#136)

* feat: download documents on the document list page

* feat: add tooltip to Form.Item

* feat: set font family to inter

* feat: add loading to ChatContainer

feat: Modify the color of the svg icon in the header according to the selected state and feat: extract routing information from the knowledge base into constants (#51)

* feat: Modify the color of the svg icon in the header according to the selected state

* feat: add translation icon to header

* feat: shorten the route length of the knowledge base

* feat: extract routing information from the knowledge base into constants