fix: add timeout/error handling for currency rate and limits API calls

[chip-peanut-bot]

Problem

Both the Manteca add-money flow and Bridge bank flow call:

1. useCurrency() → getCurrencyPrice() for exchange rates
2. useLimitsValidation() → useLimits() → /users/limits API

If either API call hangs or is slow (common on budget Android with spotty connections):

• InputAmountStep shows <PeanutLoading /> indefinitely while currencyData.isLoading
• The page appears blank/frozen with no way to interact

Neither call has a timeout, and there's no fallback UI for failed fetches.

Fix

• Add AbortController timeout (e.g. 10s) to getCurrencyPrice() in useCurrency.ts
• Add error/timeout state to InputAmountStep — show the amount input with a retry button for the rate instead of blocking the entire page
• Consider adding retry: 1 and retryDelay: 2000 to the useQuery in useLimits.ts

Context

User report: app freezes on add-money/withdraw screen. Reproducible on Motorola G31 (Android 12) and G23 (Android 14).
Investigation: https://discord.com/channels/972435984954302464/1486336087747199059/1486337803708141588