feat: add currency input to receive flows

[stackingsaunter]

Summary

Part of #2319.

Adds a reusable CurrencyInputField composed from the existing shadcn Field and InputGroup primitives, then adopts it in receive flows. The field supports bitcoin/sats display, fiat entry through the configured currency, opposite-currency preview, and context rows.

Scope

• Add CurrencyInputField
• Replace amount input in Lightning invoice creation
• Replace amount input in receive-from-on-chain flow
• Show Receive limit context from existing balance data

Validation

• yarn tsc:compile
• yarn lint before splitting the PR stack

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