Borrow page: re-introduce health lvl and make sure the calc works

see: https://github.com/honey-labs/EVM-MVP-Frontend-Redesign/pull/65/commits/93616b301f8a04e3d0b7e0b69a6f0b71568ab83e

will add more details later if its not clear, but the example should be in the solana repo as well, as it works there