She sounds unhinged.
Honestly, I could sit here and spent half a day writing you things to do, things not to do, how to establish boundaries, etc, with her... none of it will work. It would simply be like putting a tiny plaster on a huge wound.
You need to look to moving out, sooner rather than later if possible. I'm not usually an advocate for 'running away' from a situation, but I think her behaviour is so ingrained in her, it would take her to seriously (and genuinely) want to change herself for any progress to be made. And I can't see that happening any time soon. If you can't move out, then you'll have to play a very careful game of keeping distance between yourself and her. I really would double check your room's security, though, and try to spend as little time with her as possible.
The reason why I worry about you staying in the house with her is that if you stay you'll eventually start giving in for an easier life (like when you come in from work and it's been an awful day, and you say yes to her just to get her off your back). She'll slowly start to increase her hold over you and before you know it, she dictates everything you do. I'm not saying you're a weak individual or anything like that, but people like her are only happy when they're taking from someone else, and they're very good at manipulating. Just be mindful that you can't relax with this person.
Think about it. She wants you to move your PS4 that you paid good money for and enjoy using in your room so it's in a communal space. She will use it all the time and you won't get a look in. You'll be forced to spend more time with her if you want to game.
She wants you to leave your room open so she can borrow your things. She wants to have direct access to your belongings. I doubt she'd stop at borrowing a top. I genuinely think she'd go through your stuff obsessively.
She wants to eat all your baked goods because she feels as if for some reason, you are baking for her and shouldn't be baking for anyone else. She wants your nice food because she thinks she is more important than you.
She is warning you that you aren't to go away and make memories with other people because she feels like she has to be your number one and wants to be around you 24/7.
Be careful. I always get so worried when I read about things like this because it can spiral out of control so quickly. Please move out if you can, and if her behaviour gets any more controlling, get out.