We need to bring back loading states while pages complete rendering

[johngruen]

There may be some down-the-road workarounds here, but there appear to be several issues related to removing the Loading state as page components get built. To name a few:

• Colors and icons do not seem to be fetched in time making experiment cards not correctly render color or icon
• The card button state swaps subsequent to page load for installed experiments
• The experiment counts getting fetched causes card heights to change
• the Install CTA button flashes
• On experiment details page does not reflect the correct state when loaded; state changes after you see the content.

There are a lot of small cuts here but the sum total is that the site w/o loading components has significant jank associated with toggling state that damages the overall experience of the site.
Until we can resolve these conflicts without loaders we should bring them back.

[fzzzy]

Thanks for such detailed feedback.

[lmorchard]

Colors and icons do not seem to be fetched in time making experiment cards not correctly render color or icon

Peeking at this, and I think this is actually a separate issue. I'm seeing these CSP errors on dev rejecting the background colors & images for experiment cards

And I see this on dev:

[lmorchard]

Just submitted a PR to reproduce my last comment on local dev, and change CSP to allow inline styles because ugh.

[lmorchard]

Ah, looks like that was #2432 - which turns out to be CSP related, not time related, and won't be fixed by a loading delay