Improve error reporting

src/connect/ConnectButton.svelte

@@ -1,8 +1,6 @@
 <script lang="ts">
   import { Button } from '$lib/components/ui/button'
 
-  import IconPlugConnect from '~icons/material-symbols/plug-connect'
-
   const hid = navigator.hid
 
   interface Props {

src/write/WriteButton.svelte

@@ -2,8 +2,6 @@
   import { Button } from '$lib/components/ui/button'
   import { toast } from 'svelte-sonner'
 
-  import IconUpload from '~icons/material-symbols/upload-2'
-
   interface Props {
     device: HIDDevice | null
     data: number[] | null
@@ -23,6 +21,7 @@
         await device.open()
       } catch (e) {
         toast.error(`Unable to open device: ${e}`)
+        return
       }
     }