Add Video Playback of Images, forward and backward

[Luke-Schreiber]

Does this PR close any open issues?

Closes #208

Give a longer description of what this PR addresses and why it's needed

• Forward and backward playback (and pause) of images in images view toolbar
• Forward and backward playback ( and pause) of images in images view sidebar
• Adjust FPS of video playback [slow, medium, fast]
• Layout of images view sidebar updated

Provide pictures/videos of the behavior before and after these changes (optional)

(Ignore flashing issues, this is being addressed in a separate PR)

Screen.Recording.2026-01-20.at.11.30.26.AM.mov

TODO:
[ ] - Images have trouble loading quickly.

[Dev-Lan]

• remove backwards play
• switch forward back icons with something more distinct from triangle
• switch FPS config UI to speedup/slowdown UI, or discrete speed options, slow, medium, fast.
• brainstorm out of sync layers, should advancing only happen after all layers have been synced?

[Luke-Schreiber]

remove backwards play
switch forward back icons with something more distinct from triangle

Done here c40b2c7

[Luke-Schreiber]

switch FPS config UI to speedup/slowdown UI, or discrete speed options, slow, medium, fast.

Done 49ab71b

[Luke-Schreiber]

brainstorm out of sync layers, should advancing only happen after all layers have been synced?

I think this should be addressed in separate PR, due to adding complexity to sync logic.