feat(client): update chat-pannel and switch to threads

Notable changes

• Using @quilted/threads to replace remote-ui/rpc
• Change FileContext

export interface LineRange {
  start: number
  end?: number
}

export interface FileContext {
  kind: 'file'
  range?: LineRange
  language?: string
  path: string
}

• Add sendMessage to the interface Api, the sendMessage is used for scenarios like explain it.
• In the src/react update method useClient and useServer (make sure the iframe is rendering)