Potential improvements

Reuse animation after loading from old version
Fix sorting imports
Add support for Youtube Lounge API
Apply transitions where applicable
Check screen reader support
Improve editor loading animation on save
- Also include loading new subscription groups
Add ripple effect to buttons
- https://css-tricks.com/how-to-recreate-the-ripple-effect-of-material-design-buttons/
Limit refresh time of cached requests
Performance optimization with https://github.com/Skayo/svelte-tiny-virtual-list
Scroll per horizontal item (on small screens)
Editor button controls
- Allow selecting element in right-side of editor
- Add plus button to left-side of editor that adds the subscriptions to or below the selected element
- Add up/down buttons to right-side of editor
- Create add all buttons that adds all filtered subscriptions
Show add all button on empty subscriptions screen
Fix video order for livestreams
Bring Your Own API-Key (BYOAK)

On hold due to API quotas

Requires loading entire watched videos playlist
- Mark (previously) watched videos