- extractor: detect UnRAR "Cannot create...\..." error (archive with
leading-backslash internal paths) and retry in flat mode (-e) which
strips all paths and avoids the invalid double-separator on Windows
- types/download-manager: add providerLabel field to DownloadItem,
store full label (e.g. "Debrid-Link #1") set at unrestrict time
- App: display providerLabel in Service column (falls back to generic
provider name if label not yet set)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>