[Feature Request] 1. Make "Actual Size" (NumPad0) persistent between files. 2. New zoom mode: image uses a specific percentage of the screen defined by the user; 3. Manga mode: always show images starting from the top

System information

• Windows OS version: Windows 11 Home 23H2 22631.4317 (64-bit)
• ImageGlass version: 9.1.8.723 (64-bit)
• ImageGlass release: Classic

1. I miss the ability (that viewers like IrfanView have, if I'm not mistaken) to be able to see all the images in a given directory at their actual sizes, even if their dimensions are larger than the screen.
2. It would be very useful to navigate between all the files in a given directory with them using a certain percentage of the screen width/height: you could, for example, set it to use 300% width to make all the images be shown at triple the default zoom they would have with Scale to width enabled, which could be useful if you want to, for example, compare a bunch of similar images with the same aspect ratios but different dimensions, in case you want to see which one has better quality, among other use cases.
3. Manga mode (can also be named Reading mode): when enabled, it would make the images always be shown starting from the top side, so you could adjust the desired zoom level for the pages (for example, 75% of the screen width) while always starting to read them from the top.
   Also, please bring back the old IG8 behavior of always centering zoomed images when the Manga mode is disabled.

No files, tests, or entry points are named. First identify the zoom, navigation, and image-positioning areas, then clarify the design for persistent Actual Size, percentage-based zoom, Manga mode top alignment, and restored centering before implementation; done means all four behaviors work consistently between files.