refactor(common-ts): scale max amount only on non-margin-bound withdraws

[ChesterSim]

Summary

• Only over-estimate (scale 2x) the withdraw amount when a max withdraw closes out the entire deposit, so the on-chain reduceOnly clamp (non-strict) can safely absorb accrued interest.
• A margin-bound max (amount less than the full deposit) is now sent as-is, since the margin check gating the withdraw is strict and would reject an over-scaled amount.
• Uses getTokenAmount with SpotBalanceType.DEPOSIT to compute the interest-adjusted deposit token amount instead of relying on raw scaledBalance.

Test plan

• Added common-ts/tests/actions/spotWithdraw.test.ts covering margin-bound max (unscaled) and full-deposit max (scaled) withdraw scenarios.
• yarn test in common-ts/