feat: use currency input in swap flows

[stackingsaunter]

Part of #2319.

Summary

• Replaces manual swap in/out amount controls with CurrencyInputField.
• Replaces auto-swap threshold and amount controls with CurrencyInputField.
• Wires available on-chain, receive limit, spending balance, and minimum swap rows into the shared field where relevant.

Stack

• Depends on feat: add currency input to receive flows #2320 and feat: use currency input in send flows #2321.

Validation

• cd frontend && yarn tsc:compile
• cd frontend && yarn lint

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• Create PR with unit tests
• Commit unit tests in branch codex/currency-input-swap

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