observeTotalBalance
Observe total balance across all token types (available + pending).
Warning: This sums different token types together - only useful for UI "total value" where tokens are assumed to have equal value or for displaying aggregate statistics. Do not use for financial calculations.
Uses BigInteger to prevent overflow with large balances.
Matches Midnight SDK: getTotalBalances() (sum of available + pending)
Return
Flow of total balance amount across all tokens as BigInteger
Parameters
address
The unshielded address to track