E-ink enhancements - remove sidebar slide in/out animation, greying out of article list

[chadchad4423]

Two related items would help immensely with eink use:

1. It'd be great to be able to suppress animations app-wide. The only one I've noticed is the slide in/out of the side menu.

2. When the side menu is expanded, what's left of the article list showing through is greyed out. This causes ghosting and unnecessary and/or unnecessary refreshing. I'm not sure what the "right" fix is for this, but one idea is to have the side menu completely fill the screen instead of leaving some of the list visible. I'm 100% open to other fixes though. I could see how expanding the sidebar to the full width of the screen makes returning to the article list less intuitive.

[chadchad4423]

Took a pass at this one too: https://github.com/chadchad4423/capyreader/tree/reduce-motion

Adds a "Reduce motion" toggle that removes the drawer's dimming overlay and skips the slide animation (opens/closes instantly instead). Didn't touch the full-width-drawer idea — the toggle felt like a smaller change, but that's still on the table if you'd rather go that route.