Failed upload into a deleted folder throws an uncaught error #4318

Initial Checklist

• I understand this is a bug report and questions should be posted in the Community Discussions
• I searched issues and couldn’t find anything (or linked relevant results below)

Bug Description

Since #4207, a failed upload into a folder that no longer exists throws an uncaught "Resource not found" page error. The upload panel shows the failure correctly, but the file list refresh that #4207 now also runs for failed uploads isn't guarded.

Reproduction Steps

1. Open a folder
2. Delete that folder in another tab (or via WebDAV)
3. Upload a file into the still open folder, then retry it

Expected Outcome

The upload panel shows the failure, without an uncaught error.

Actual Outcome

The upload fails (412), then a PROPFIND on the folder returns 404 and Resource not found is thrown as an uncaught page error, again on every retry. useFileUpload.ts refreshes on result.successful?.[0] || result.failed?.[0] and the refresh (getDrive / listFiles) has no error handling.