Theme switch support (#3568)

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: locate the specific location of the document based on the coordinates of the chunk and add Upload to AssistantSetting (#92)

feat: add Preview with react-pdf-highlighter (#89)

feat: add SelectFiles and add KnowledgeTesting (#60)

feat: save the selected parser to the backend on the upload file page and upload document (#54)

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: layout the knowledge list page and modify the page switching button in the header (#48)