[SDK] feat: Enhance fiat onramp with multi-step flow and currency support

[joaquim-verges]

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PR-Codex overview

This PR revamps the fiat onramp UI in the PayEmbed, introduces support for multi-hop onramp flows, and updates various components and functions related to fiat transactions.

Detailed summary

• Renamed Top up to Fund Wallet in multiple places.
• Removed FiatFlow and FiatStatusScreen components.
• Added support for new fiat currencies: AUD and NZD.
• Updated currency selection and icon rendering logic.
• Enhanced OnRampScreen for better flow handling.
• Refactored getFiatSymbol and related functions for improved currency management.
• Implemented StepConnectorArrow for UI consistency in transaction steps.
• Improved error handling and loading states in transaction processes.
• Updated various hooks to streamline data fetching and state management.

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[changeset-bot]

🦋 Changeset detected

Latest commit: 9fd1688

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
thirdweb	Patch
@thirdweb-dev/wagmi-adapter	Patch

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[joaquim-verges]

• [SDK] feat: Enhance fiat onramp with multi-step flow and currency support #6323 👈 (View in Graphite)
• main

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[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
thirdweb (esm)	46.3 KB (0%)	926 ms (0%)	334 ms (-12.99% 🔽)	1.3 s
thirdweb (cjs)	121.87 KB (0%)	2.5 s (0%)	1.1 s (+39.79% 🔺)	3.6 s
thirdweb (minimal + tree-shaking)	5.6 KB (0%)	112 ms (0%)	96 ms (+252.41% 🔺)	208 ms
thirdweb/chains (tree-shaking)	506 B (0%)	10 ms (0%)	42 ms (+727.24% 🔺)	52 ms
thirdweb/react (minimal + tree-shaking)	19.31 KB (+0.1% 🔺)	387 ms (+0.1% 🔺)	63 ms (-55.04% 🔽)	449 ms