[app] fetch balance from contract#15

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citrusinesis wants to merge 3 commits intomainfrom

Commits on Sep 22, 2025

feat: implement useBalanceSheet hook for calculating and formatting balance data
citrusinesis
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feat: add BalanceData type export and ensure proper export of WithdrawStatus
citrusinesis
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feat: replace static BALANCE_DATA with dynamic balanceData from useBalanceSheet hook
citrusinesis
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