display yt-dlp version, multiple downloads enabled.

code refactoring
preparations for optimistic ui updates for new downloads

frontend/src/components/HomeActions.tsx

@@ -1,6 +1,6 @@
 import { Suspense, useState } from 'react'
 import { useRecoilState } from 'recoil'
-import { loadingAtom } from '../atoms/ui'
+import { loadingAtom, optimisticDownloadsState } from '../atoms/ui'
 import { useToast } from '../hooks/toast'
 import DownloadDialog from './DownloadDialog'
 import HomeSpeedDial from './HomeSpeedDial'
@@ -8,12 +8,32 @@ import TemplatesEditor from './TemplatesEditor'
 
 const HomeActions: React.FC = () => {
   const [, setIsLoading] = useRecoilState(loadingAtom)
+  const [optimistic, setOptimistic] = useRecoilState(optimisticDownloadsState)
 
   const [openDownload, setOpenDownload] = useState(false)
   const [openEditor, setOpenEditor] = useState(false)
 
   const { pushMessage } = useToast()
 
+  // it's stupid because it will be overriden on the next server tick
+  const handleOptimisticUpdate = (url: string) => setOptimistic([
+    ...optimistic, {
+      id: url,
+      info: {
+        created_at: new Date().toISOString(),
+        thumbnail: '',
+        title: url,
+        url: url
+      },
+      progress: {
+        eta: Number.MAX_SAFE_INTEGER,
+        percentage: '0%',
+        process_status: 0,
+        speed: 0
+      }
+    }
+  ])
+
   return (
     <>
       <HomeSpeedDial
@@ -27,7 +47,9 @@ const HomeActions: React.FC = () => {
             setOpenDownload(false)
             setIsLoading(true)
           }}
+          // TODO: handle optimistic UI update
           onDownloadStart={(url) => {
+            handleOptimisticUpdate(url)
             pushMessage(`Requested ${url}`, 'info')
             setOpenDownload(false)
             setIsLoading(true)