If you’re using a webpage JavaScript can see your mouse cursor and anything you type. But only if the browser has focus. So if you’re typing in another window it can’t

It’s not difficult to turn off.

Night’s Dawn Trilogy, Peter F Hamilton. Better than his later stuff in my opinion

There are a lot of bits of my job enjoy, when I retire I shall just putter about and spend some time doing those bits and get paid less money for doing it

I’m sorry you haven’t met one (or recognised it when you did). They exist

Good. Used keepass for years, also useful for storing other confidential info. Put the app & vault in one cloud storage, key file in another and you’re synced across multiple computers, add an app for your phone and you’re good to go and surely reasonable secure providing you use a long password too.