Consume the import endpoint's NDJSON progress stream via a new postStream
client helper (reuses the bearer token and 401 refresh, but keeps the body
as a stream). The Settings import card now renders a live progress bar
(processed/total) and a scrolling per-file list where each entry shows its
status — imported, skipped or error — with the failure reason inline and the
newest row kept in view. A final summary replaces the old single-shot result.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
H1K0
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