Refresh Room Activity Indicators

[Anderas]

Replace legacy activity indicators with updated ones for entering an existing room. See #4829 for further context.

• consider dark mode
• overlap with "jump to unread"
• consider home vs room indicators on iPads

Figma designs

[Anderas]

Pay attention to the fact that other UI may be obscuring / be obscured by the loading indicator, eg "jump to unread"

[daniellekirkwood]

@amshakal to suggest how to move the 2 indicators. Also need info for Dark Mode and iPad things...

[amshakal]

1. Dark Mode: Added a subtle drop shadow to the indicator for dark mode. Link to figma

2. Overlap with "jump to unread": Is it possible to hide jump to under while it's syncing or loading? Or would there still be situations where showing both will be a hard requirement?

3. Home vs Room indicators: I think I need more context to provide direction on this

[Anderas]

Thanks @amshakal

1. I've added you as a reviewer to Enable home activity indicator #5665 which contains some dark mode previews, but the shadow clearly needs to be more prominent
2. I will try this out unless the complexity is too high
3. Home vs Room on iPad means we might have to show potentially two spinners at once as on this screenshot. Personally it makes sense to me, if you are okay with it (ignore the loading in the middle of the screen, only the two around navigation bars).