- Add a leading selection checkbox to each desktop + mobile row, threaded from
the page through TrackerBucket via an optional RowSelection prop (renders only
when the page supplies a toggle handler).
- Page owns the selection Set; a sticky bottom action bar appears when ≥1 bill is
checked: "N selected · Pay · Skip · Clear".
- Pay selected reuses the bulkPay item shape + Undo from "Pay all due".
- Skip selected fans out saveBillMonthlyState (no bulk endpoint; skip has no money
effect) with Promise.allSettled, an aggregated "n skipped / m failed" toast, and
an Undo that un-skips. Selection clears on month change.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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