chore: bump @reserve-protocol/react-zapper to 2.7.2

[devin-ai-integration]

Summary

Picks up react-zapper 2.7.2, which fixes a stale price in the zap modal: the DTF price (and the selected token's price) were fetched once when the widget mounted and never refreshed — Register sets refetchOnWindowFocus: false, so nothing re-triggered them — while the quote itself refreshed every 9s. Since 2.7.1 both legs' USD values and priceImpact/truePriceImpact are computed from those Reserve prices, so on redeem the "you pay" value and the impact could be derived from a price minutes old. Both price queries now run on the quote's refreshRate, so both legs are priced from the same moment.

Dependency bump only (package.json + lockfile); no app code changes.

Link to Devin session: https://app.devin.ai/sessions/217c81a67bbd4cd381366a5adf7356d9
Requested by: @pmckelvy1

[devin-ai-integration]

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