[READY] Optimize token selection

[Sharqiewicz]

Summary

• Centralize token balance fetching into a dedicated service and Zustand store
• Remove redundant balance fetching hooks that caused unnecessary re-renders
• Improve token sorting by USD value with fallback to raw balance

Changes

New Files

• apps/frontend/src/services/balances/ - Centralized balance fetching service
• assetHubBalanceFetcher.ts - Fetches AssetHub token balances with USD prices
• evmBalanceFetcher.ts - Fetches EVM token balances
• apps/frontend/src/stores/tokenBalanceStore.ts - Zustand store for balance state
• apps/frontend/src/hooks/useInitTokenBalances.ts - Hook to initialize balances on wallet connect
• apps/frontend/src/hooks/useMaintenanceStatus.ts - Extracted maintenance status logic

Removed Files

• apps/frontend/src/hooks/useOnchainTokenBalances.ts - Replaced by centralized service
• apps/frontend/src/hooks/useOnchainTokenBalancesSorted.ts - No longer needed
• apps/frontend/src/hooks/useTokensSortedByBalance.ts - No longer needed

Modified Files

• apps/frontend/src/components/TokenSelection/TokenSelectionList/components/SelectionTokenList.tsx - Use balance store, improved sorting
• apps/frontend/src/layouts/index.tsx - Initialize balances at app level

Test Plan

• Connect EVM wallet and verify token balances load
• Connect Polkadot wallet and verify AssetHub token balances load
• Open token selection modal and verify tokens sort by USD value (highest first)
• Verify AssetHub tokens (DOT, USDC, USDT) show correct USD values
• When USD values are equal, verify tokens sort by raw balance

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[ebma]

Looks good ✅ let's fix the sorting with having the stablecoins on top of the list in a follow-up.