Vault detail: incorrect coin balance scaling and render perf on large state updates

[Muskan121622]

ssue Description

• Summary
  • Coin balances and reserves were always divided by 10**18 in getBalances , causing incorrect values for ERC-20 tokens with other decimals. The vault client also recalculated formatted numbers on every render.
• Impact
  • Users see wrong balances/reserves for tokens not using 18 decimals.
  • Extra render work increases UI latency during frequent state updates.
• Fix
  • Use vault.decimals || 18 to scale coinReserve and coinBalance .
  • Memoize formatted display numbers with useMemo .
  • Keep hodlCoinBalance at 18 decimals (HodlCoin).
• References
  • Scaling fix: app/[vaultId]/InteractionClient.tsx:291–296
  • Memoization: app/[vaultId]/InteractionClient.tsx:400–409 , 501–513
• Verification
  • IDE diagnostics clean.
  • Manual check for tokens with non-18 decimals to confirm displayed balances match on-chain