Replace unprocessed_files stat with pending_segments
Refactor journal stats to use observe.sense.scan_day() for detecting
unprocessed media files, replacing the old defunct *_raw.flac pattern
matching. The new pending_segments stat counts unique segments with
pending files rather than individual file counts.
- Add pending_segments return value to sense.scan_day()
- Update journal_stats.py to use sense_scan_day() (DRY)
- Update dashboard.js repair alerts for new stat name
- Fix conftest.py to import real observe.sense module
- Remove unused fixtures/journal/stats.json
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>