Problem: the queue/priority view sort in `sort_tasks_priority()` uses a
hardcoded tiebreak chain (status, priority, due, order, id). Users who
care more about due dates than priority have no way to reorder it.
Solution: add `view.queue.sort` config field (string[]) that defines an
ordered tiebreak chain. `build_queue_comparator()` maps each key to a
comparison function and returns a single comparator. Unknown keys emit a
`log.warn`. The default matches the previous hardcoded behavior.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Barrett Ruth
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