Adds a new filter toggle to the Downloads view that allows users to hide
superseded failed downloads. The filter is enabled by default and passes
exclude_superseded=true to the API when active.
Changes:
- Add filterExcludeSuperseded ref initialized to true
- Add filterExcludeSuperseded to watch dependencies
- Include exclude_superseded param in loadDownloads() when true
- Add v-switch toggle UI control below date filters
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
bvandeusen
Bryan Van Deusen