jotai migration (#221)

frontend/src/atoms/ui.ts

@@ -1,14 +1,10 @@
-import { atom, selector } from 'recoil'
+import { atom } from 'jotai'
 import { activeDownloadsState } from './downloads'
 
-export const loadingAtom = atom({
-  key: 'loadingAtom',
-  default: true
-})
+export const loadingAtom = atom(true)
 
-export const totalDownloadSpeedState = selector<number>({
-  key: 'totalDownloadSpeedState',
-  get: ({ get }) => get(activeDownloadsState)
+export const totalDownloadSpeedState = atom<number>((get) =>
+  get(activeDownloadsState)
     .map(d => d.progress.speed)
     .reduce((curr, next) => curr + next, 0)
-})
+)