fix(contracts): use Solady mulDiv in RayMathLib mulRayDown and divRayDown to prevent intermediate overflow - #678
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…Down to prevent intermediate overflow
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Updated mulRayDown and divRayDown in RayMathLib to use FixedPointMathLib.mulDiv. Previously, plain multiplication x * y / RAY and x * RAY / y could cause intermediate uint256 overflow for large token balances before division. Using mulDiv provides 512-bit intermediate precision, aligning with mulRayUp and divRayUp.