When inputting an amount higher than the max balance, the UX has strange behavior

[LyonSsS]

Severity: Low | Priority: Low

Short Context

When using the keyboard to manually input an amount to the "Amount to transfer" field, if the inputted value is > available balance, the UI inform the user that "Amount exceeds the account balance" but does not block the actual transfer/approve token button. Also the value calculated to this faulty action is by using the first digits that creates a number < balance.
The button should be grayed out and action should not be permitted.