Fix reader width (#567)

* Fix reader width

The margin: auto on the Box container for the image was preventing 100% width
to actually mean 100%.

Now that 100% is actually possible, I think fitPageToWindow makes more
sense as a default. Additionally, since the image can fill 100% of the
page, it can cover the ReaderNavBar, so set the z-index of the
ReaderNavBar so it's rendered on top of the image and clickable.

Signed-off-by: Chance Zibolski <chance.zibolski@gmail.com>

* Support configuring reader width for DoublePage readers

Signed-off-by: Chance Zibolski <chance.zibolski@gmail.com>

* Fix single page of DoublePageReader not being able to take up full width

In case the parent container is flex row, the container does not automatically take up 100% of the available width, thus, the page also was not able to take up 100% of the width

* Fix applying reader width to double pages

The set reader width can't be applied to each page of the double pages because otherwise it will already take up 100% of the available width with the setting only being at 50%.

Instead, the set width has to be divided by 2, so that both pages take up the set reader width

* Prevent double page spinner from being larger than 100% of the available width

* Update width styling of the page spinner

* Always center pages in the middle of the screen

* Take up full height fitting page to window height

---------

Signed-off-by: Chance Zibolski <chance.zibolski@gmail.com>
Co-authored-by: schroda <50052685+schroda@users.noreply.github.com>

src/screens/Reader.tsx

@@ -400,7 +400,12 @@ export function Reader() {
     return (
         <Box
             sx={{
-                width: settings.staticNav ? 'calc(100vw - 300px)' : '100vw',
+                display: 'flex',
+                flexDirection: 'column',
+                alignContent: 'center',
+                justifyContent: 'center',
+                minWidth: settings.staticNav ? 'calc((100vw - (100vw - 100%)) - 300px)' : '100vw - (100vw - 100%)', // 100vw = width excluding scrollbar; 100% = width including scrollbar
+                minHeight: '100vh',
                 marginLeft: settings.staticNav ? '300px' : 'unset',
             }}
         >