feat: frontend ACT balance tracking and display

[baktun14]

Context

Part of AEP-76 BME migration. The frontend needs to display ACT balances and support ACT as a deployment denom for managed wallets.

Tasks

Balance Tracking

• Update apps/deploy-web/src/hooks/useWalletBalance.ts:
  • Add balanceUACT, totalUACT fields to balance types
  • Add case "uact": to useDenomData switch
  • ACT-to-USD conversion is 1:1 (ACT is USD-pegged)

Denom Hooks

• Update apps/deploy-web/src/hooks/useManagedWalletDenom.ts:
  • Support "uact" as a managed wallet denom option
• Update apps/deploy-web/src/hooks/useDenom.ts:
  • Add ACT entry to useSdlDenoms(): { id: "uact", label: "uACT", tokenLabel: "ACT", value: "uact" }

Price & Conversion Utils

• Update apps/deploy-web/src/utils/priceUtils.ts:
  • Handle uact in coinToUDenom/coinToDenom

Transaction Support

• Update apps/deploy-web/src/context/WalletProvider/WalletProvider.tsx:
  • Add BME message types to MESSAGE_STATES (if new tx types are needed)
• apps/deploy-web/src/utils/TransactionMessageData.ts:
  • Already uses [Source.grant, Source.balance] — verify compatible with uact
  • Update labels/comments if needed

Acceptance Criteria

• Managed wallet users see ACT balance displayed as USD equivalent
• SDL editor allows selecting uact as a denom
• Deployment creation works with uact denom in the UI
• Balance displays show correct amounts for ACT-funded deployments

Milestone

AEP-76: BME Migration — Phase 3 (Frontend)

Reference

• docs/aep-76-bme-migration-plan.md