Glad things are going well

and if anyone deserves sn unproductive day, it's you!
I suspect dh is upbeat because this is a relief for him, as well as you. I don't want to make assumptions about how he feels, but it was a difficult and fraught situation for him, too. Perhaps moving out has given him space to sort out his thoughts a little. He may have felt burdened by the sense of responsibility -- though his behaviour may have made it seem like he didn't care, depression makes you feel incredibly useless, hopeless and guilty. While we tend to think of relationships and family as sources of support, which is true, they can also feel like a burden when you have mental health problems. It feels like you're not living up to your side of the bargain and it takes its toll.
You are probably better positioned to help dh as a friend, rather than a wife. He needs to take responsibility for himself and learn that he is strong enough to manage his mental health in the long term. You can provide help and support, but you couldn't continue to give so much of your time and energy that it affected your wellbeing.
Have you tried explaining to dd that dh's depression makes it hard to communicate how he feels? I think that's true of a lot of men in general -- they connect more easily with sons because they think they have more in common and can relate to them. It becomes a bit of a self-perpetuating thing, because it means they are more likely to spend time with their sons (eg going to football coaching/matches), which makes them feel more connected.
It's the same with me and my dad: I'm convinced, most of the time, that he prefers my brother because they do more stuff together (golf, skittles, watching/talking about various sports). My mum claims otherwise, which makes sense because my brother is a **** most of the time! I soend more time with my mum, which I suppose balances it out.
Maybe tell dd that while it's difficult atm, her dad needs support from all of you. As you say, a couple of minutes together can make a huge difference. If she feels she can't express herself in person, maybe she could write or make a card for her dad? Nothing too full-on -- a simple "thinking of you" is perfect. I think it's important for both dd and dh to keep the channels of communication open, without forcing the issue.
Sending you happy vibes
Rainy day fund — 210/1000 Emergency fund — 1019/1500
Loan — 314/19,224 = 1.6% Fun fund: 1/100 Credit card balance — 0