If you really want a shower curtain, one thing I really like in some hotel rooms are shower curtains with a gauzy/sheer border on top. If you can sew, you could buy a standard curtain and add the border, to give you the length you want. Here’s an example of one.

https://www.bedbathandbeyond.ca/store/product/hookless-reg-waffle-fabric-shower-curtain/3253374

I have a 96" shower curtain. I purchased two and had a seamstress add the bottom portion on for the additional length. It can work if there is a pretty border break; mine looks perfect. You would never know it was added and the total cost was only around $60 because I found the two curtains on clearance at Ballard Designs.

However, with that all said, I also think the clear glass doors would be the best option for you. Good luck!

I would do a shower screen IMO shower curtains only look good when left open except for when they are used and so really do not hide anything and always close in the space.. As for the window a nice simple blind in in white .

Contact a good glass company that is used to doing new construction work and put a glass partition there. They could do frameless or framed.

I hope you can fit a glass swivel screen on the tub.

Reality check -- this could happen -- I tried to install a glass screen, but in my 1939 house, the existing cast iron tub, refinished and retained, sloped too much for a glass screen. The glass company tried to come up with a solution, but couldn't -- it would leak for sure.

I would do a simple shower curtain left open and black and white toile Roman shade. Also a long white chenille bath rug

Maybe you could get an L-shaped curtain rod, so that you leave the shelves outside, and then a regular curtain (or one for each arm of the L) would work fine.

If you keep the curtain tucked into the shower, it doesn't have to crowd you at the sink, but it will make the room feel smaller for sure. I'm sorry you don't love the shower tile (which I think is pretty spiff!), but I'm not sure it's worth turning your bathroom into a tunnel in defiance. You'll probably end up wanting to leave it open, whatever curtain you find, for mental space.

To get the longer length and more width, I would look at sheer drapes, start with Ikea. You could have stainless steel small grommets installed by a tailor or drapery firm or if you sew, use the button hole stitch setting on your sewing machine. I like the look of two drapes when they are left opened. You would need two separate liners in this case.

I like this one:

96 inch wide shower curtain on Amazon

They have other ones, too. Just put 96 inch wide shower curtain in the search box. If you want to sue the curved rod (I personally wouldn't in such a narrow space), you need it wider than 92 inches.

Yeah, if you ever plan to bathe children in that tub, you don't want glass. I would not get a curved curtain rod, though. I think it will stick out too far. I also wouldn't do the L shaped one. The curtain will always be flopping on that end deck. You got some great ideas for doing a wide curtain.

I do think it's a very nice, modern bathroom. I personally really like the tile.