Sam/fix max unsupported

[samholmes]

CHANGELOG

Does this branch warrant an entry to the CHANGELOG?

• Yes
• No

Dependencies

none

Requirements

If you have made any visual changes to the GUI. Make sure you have:

• Tested on iOS device
• Tested on Android device
• Tested on small-screen device (iPod Touch)
• Tested on large-screen device (tablet)

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Note

Reworks ramp amount handling to a discriminated exchangeAmount union, extracts region selection into RampRegionSelect, updates form/disable logic and max flow, and aligns all ramp plugins with the new API.

• Frontend (RampCreateScene):
  • Replace userInput/isMaxAmount with discriminated exchangeAmount ({ amount } | { max: true } | { empty: true }).
  • Introduce AmountTypeSupport as onlyCrypto/onlyFiat and update all disable/guard logic and Next button conditions.
  • Rework display amount derivation to compute conversions inline; remove helper converters.
  • Revise max-flow handling (selection, auto-navigation, persistence) using exchangeAmount.max.
  • Compute input disabled states based on exchangeAmount.max, quote availability, and amount-type support.
  • Extract region selection UI to new component components/scenes/RampCreateScene/RampRegionSelect and use it when needed.
• Types:
  • Add RampExchangeAmount type and change RampQuoteRequest.exchangeAmount to use it.
• Plugins (banxa, bity, moonpay, paybis, revolut, simplex):
  • Update quote handlers to read exchangeAmount via 'max' in/'amount' in checks.
• UI Cleanup:
  • Simplify region selection rendering; remove in-scene steps/flag logic in favor of RampRegionSelect.

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