Three state bugs found during audit:
1. _failedAccounts / _accountOverrides survived across batches. A
rate-limited account from batch 1 stayed permanently blacklisted
for the rest of the app session, so batch 2 skipped straight to
the fallback even after the original recovered. Now cleared in
startBatch so each run evaluates accounts fresh.
2. Account rotation was one level deep. With three accounts [A,B,C]
on the same hoster and A + B both failing, the job errored out
— C was never tried. The fallback-retry was a single if-block.
Replaced with a while-loop that keeps asking main for the next
override and rotating until every account is exhausted.
3. Queue sort cache included 'size' as a static key, but bytesTotal
goes 0 → actual when previews resolve. A queue sorted by size
during preview would cache the all-zeros order and never update.
Removed size from _STATIC_SORT_KEYS — it now re-sorts per render
like status/speed/progress.
880537dcfb