The stardust is a given. As for sunlight, all the energy including somewhat arguably geothermal (using the suns gravity to help form the earth and I guess radioactive material being formed by other stars) comes from the sun and gets converted into chemical energy you eat so you’re stardust animated by sunlight (mainly).
Yes in the long term there’s no such thing as renewable energy since entropy always increases. It’s a misnomer that only has meaning in small human timescales.
Yeah if the big crunch is accurate and the universe is eternally expanding and contracting then all energy is renewable. Although this is way way outside the scope most normally have in mind when speaking about renewable energy.