Quick-pay was duplicated verbatim in TrackerRow and MobileTrackerRow (create
payment + Undo toast + refresh, with a manual busy flag on mobile). Extracted
into a shared useQuickPay() React Query mutation hook: isPending comes for free
(replaces the quickPaySaving state), the tracker/badge caches invalidate on
settle, and the flow lives in one place. Behavior identical.
(togglePaid keeps its local optimistic flip as-is; other mutations can adopt the
same useMutation pattern incrementally.)
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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