The payment-history list (rows with source badges + edit/remove for manual
payments) and its 4 display helpers (isTransactionLinkedPayment,
isHistoryOnlyPayment, paymentSourceLabel/Tone) move to their own presentational
component; the parent keeps payment state + add/edit/delete handlers and passes
them as props. Behavior-preserving — BillModal 1603 -> 1502 lines; build +
client tests green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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