There are already suggestions here for the bath/shower issue. Take a blow up/collapsible alternative. There are lots of holidays without baths like camping. It's about finding a way. On our lodge holidays we tend to just shower at the swimming pool. I know your daughter doesn't like showers but what's she like at a pool?
I've seen your comment about worrying that people will judge you for being in an accessible lodge. Not all disabilities are visible and no one should give a monkey's arse about who's in which lodge. I've certainly never given it a second thought.
His sending you a link to the wrong cabin could've been on purpose but it also could have been careless low level incompetence.
The main thing is: he's booked the holiday. It would be worse if he'd not got it sorted at all.
It's frustrating when someone doesn't do something to the standard you would have or uses weaponised incompetence to ensure you do the labour of booking future holidays. However, there's also every chance it just doesn't matter as much to him and you're letting it get to you way more than it should because it's a symptom of something bigger in your relationship and family dynamics.
My worry is that you go on this holiday and you mention the shower thing over and over or you moan about being embarrassed about being in the accessible lodge. Those are things you have control over. That's about your own mindset and approach to things.
Have you read the Let Them Theory? Let him make some minor errors in your holiday booking. Then comes the Let Me bit - that's where you pack a paddling pool for the bathroom, that's where you make sure he does bathtime at least half of the week with your child, that's where you delight in the silliness of the situation, where you laugh about that time you ended up in a lodge with no steps instead of a balcony - I don't know.
I just know that the people in my life who are happier and find more joy in the every day are the ones who don't sweat the small stuff and take a step back to go "this thing has pissed me off but is it actually a big deal or am I making a mountain out of a mole hill?" and usually, it's not something that matters that much.
You're on the cusp of ruining a holiday because you want it to be perfect. The extra bathtime faff doesn't have to be a massive deal - it's a paddling pool and bath toys. It's a funny story when your child's older "remember that holiday where you had to have a bath in a paddling pool? lol"
That said, I'm very concerned by your comment that your husband "doesn't parent" during the week. Does he work away? Do his work shifts mean he's not home at the same hours your child is awake?