Add Arbitrum network support to balance fetching

[MusabShakeel576]

Summary

This PR adds support for the Arbitrum network to the balance fetching functionality, enabling users to view their native ETH balances and prices on Arbitrum alongside existing supported networks (Ethereum mainnet, Fuse, and Base).

Key Changes

• Import Arbitrum chain: Added arbitrum to the viem chains imports in both hooks/useBalances.ts and constants/tokens.ts
• Balance fetching: Extended fetchTokenBalances to fetch native ETH balance on Arbitrum using the public client
• Price fetching: Added price fetching for Arbitrum's native ETH token via the CoinGecko API
• Token processing: Implemented logic to process and format Arbitrum ETH balances, including:
  • Validation of fulfilled balance promises
  • Price value extraction with fallback to 0
  • Token metadata lookup from the token list
  • Creation of native token objects with proper chain ID and token information
• Token constants: Updated NATIVE_TOKENS and NATIVE_COINGECKO_TOKENS mappings to include Arbitrum's ETH token configuration

Implementation Details

The Arbitrum implementation follows the existing pattern used for Base and Fuse networks:

• Uses the same native token symbol ('ETH') and CoinGecko ID ('ethereum')
• Maintains consistent token object structure with TokenType.NATIVE designation
• Properly handles promise settlement status checks before processing balance data
• Integrates seamlessly with the existing token list lookup mechanism

https://claude.ai/code/session_01ThYo8D5jLeC2PfaiSGC7Ud

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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
solid-app	Ignored		May 24, 2026 9:55am
solid-app-staging	Ignored		May 24, 2026 9:55am