The correct answers are I wish I didn't have to work tomorrow. and If only we lived in a giant mansion.

We use the past simple ("didn't have to", "lived") to talk about imaginary present or future situations.

"Are" is present tense (it should be "were"). Also, we generally cannot use wish + would with "I" or "we" to talk about our own actions—we use "could" or the past simple instead!