Strata Markets Update - Isolated and Saturn Strate

The `Tranche` contract calculates newly minted shares before the deposit executes and relies on the composite strategy's reported `depositFeeBps()`, which is always zero. A Midas deposit can subsequently receive less value than supplied because of an underlying fee or accepted slippage, and only this net value is credited to accounting. Because the user already received shares based on the gross value, the resulting NAV reduction is distributed across both the new shares and all existing shares. Existing depositors therefore bear part of a fee caused by the new depositor.