Add subaccount import and spy mode

[VSBDev]

Summary

• Allow operators to inspect and manage non-contiguous EVC subaccounts without adding every intermediate account tab.
• Add a minimal read-only spy mode so a wallet's subaccounts can be inspected locally from ?addr=... without connecting that wallet.
• Declare the React Query dependency that the app imports directly.

Changes

• Replace the contiguous numSubAccounts model with explicit subAccountIds, building sparse lens bitmasks from the loaded IDs.
• Add + New for the next unused subaccount and Import for either a numeric ID or a derived subaccount address.
• Add reverse subaccount derivation and validation for imported addresses.
• Split inspected address state from connected wallet state with walletConnected, spyMode, and canWrite, then disable write actions while spying.
• Preserve ?addr=... across primary nav links and show a spy-mode banner when viewing another address.
• Update npm dependency metadata for the direct @tanstack/react-query import.

Test plan

• npm run build
• npm exec eslint -- src/Account.jsx src/App.jsx src/Utils.jsx
• Open /account/?addr=0x416C6013260F0762C500F1F48dB5e403Bf293367 locally and import subaccount 15
• Connect a wallet and verify + New still adds the next unused subaccount
• In spy mode, verify install/edit/uninstall/approve/swap actions are disabled