I have the S23 ultra, which has about the same display
It can go very dim with just the standard slider already and on top you can toggle extra dim which has it's own extra slider. In my pitch black room, reading white on black text I have to stop the extra dim slider to about 3/4th before it starts being too dim to see the screen.
There's also the blue light filter slider (they call it eye comfort shield) that you can also add on top, it'll turn everything more on the orange/yellow side making it easier on the eyes.
Otherwise, I say you can't go wrong with the S series of samsung phones, they'll last a long time and have the top specs of that year. The S23 has an aluminum frame and if it's any close to mine it's very tough, I like looking at durability tests on youtube to get a good idea of how much damage it can take. 100% you have to get a screen protector, film ones work okay, but glass protectors are wayyy better. Glass protectors just feel the same as the display, though if you plan to be rough with it film protectors are easier to replace. I got mine from whitestone, Spigen is good and well recognized too. I say to get a screen protector because just taking it in/out of your pocket after two days you'll start seeing micro scratches, so this would help with the longevity of the device.
There seems to be some on OpenSubtitles .org
have you looked at the megathread in the sidebar? There's a subtitle section under "Movies & TV"