refactor: drop vestigial mid-page progress block on album upload (#1261)
Since #1238 added per-track toasts and TrackEntryCard now renders an
inline status pill (uploading/processing/completed/failed) next to each
track, the mid-page "N of M completed, K uploading..." progress block
was showing the same information a third time. Removed it along with
the completedCount/activeUploadCount derived state and the
.upload-progress CSS.
The toasts are the richest view (per-track title, live XHR %, SSE phase
messages, success/fail with error detail) and the per-card pill keeps
users oriented within the form. The mid-page block added noise without
new information.
Known trade-off left for later: a very large album (e.g. 20 tracks)
will stack a lot of toasts. If that becomes a real problem, we can
reintroduce a centralized summary or change the toast strategy — for
now the concern is theoretical.
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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