Builds on 513b191. Consumes the new metadata fields in the Downloads
Details modal:
• Run stats rows — exit code, downloaded/skipped/per-item-failures/
warning counts, duration. Zero-value rows hide to reduce noise.
Files Downloaded row prefers run_stats.downloaded_count with
file_count fallback for pre-migration rows.
• Errors & Warnings panel — new panel at the top, populated from
metadata.stderr_errors_warnings and open-by-default when present.
• Copy-to-clipboard buttons — small icon button on each log panel
title, uses navigator.clipboard with snackbar confirmation.
• Verbose log filter — substring filter on the stderr panel.
Graceful for existing rows: every new field is v-if-gated so sessions
saved before the backend change still render correctly with their
old-shape metadata.
bvandeusen
1f677b6862