[openstreetmap/openstreetmap-website] Css spinner delay (PR #5315)

[Anton Khorev]

Similarly to #5307, we can avoid scheduling/unscheduling js events to show spinners in the richtext preview #5311 and the sidebar loader:

![image](https://github.com/user-attachments/assets/238f7ea7-f2e1-45c7-8ac4-e6f42ac3c2f0)

There's a delay to avoid blinking on fast loads, that delay can be implemented using a css animation.

And we also can stop using `vendor/assets/jquery/jquery.timers.js` which does some ill-advised things like [listening to `unload`](https://developer.mozilla.org/en-US/docs/Web/API/Window/unload_event).
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5315

-- Commit Summary --

  * Show spinner using delayed css animation in richtext preview
  * Show spinner using delayed css animation in sidebar loader

-- File Changes --

    M app/assets/javascripts/index.js (11)
    M app/assets/javascripts/richtext.js (9)
    M app/assets/stylesheets/common.scss (12)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5315.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5315.diff

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