fix: add warning type support to toast config

[esaugomez31]

Summary

Adds warning type support to the toast notification system to prevent app crashes when a toast with type: "warning" is shown.

Problem

The app crashes on the receive screen when onChainAddressCurrent fails, because toastShow is called with type: "warning" but react-native-toast-message only had success and error configured. Closes #3734.

Changes

• Added warning renderer to toastConfig in galoy-toast.tsx with amber border color (colors.warning)
• Replaced ternary in toast.ts with a toastTitle map for cleaner type-to-title resolution
• Added tests for all three toast types

[esaugomez31]

• fix: add warning type support to toast config #3736 👈 (View in Graphite)
• main

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[dolcalmi]

looks good, just minor validation