On ZIMs that pack one logical article as several sub-pages (e.g. iFixit),
iterByPath yields more entries passing our isArticleEntry() filter than
archive.articleCount reports. The inter-batch progress used nextOffset /
articleCount, so the numerator outran the denominator, the ratio overflowed past
100%, and the UI (which clamps at 99%) pinned the file at 99% for the entire
remaining tail, making it look hung.
Grow the denominator to max(articleCount, nextOffset + ZIM_BATCH_SIZE) once we
pass the reported article count, so progress keeps creeping forward monotonically
instead of freezing, and clamp to 99% so only the genuinely-final batch reports
100%.
This is a graceful heuristic, not exact progress (true accuracy would require a
pre-scan to count isArticleEntry matches up front); it removes the user-visible
"stuck at 99%" symptom with no change to batch semantics.
Closes#903
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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