fix: Show version number with card loading spinner (#1825)

- Closes #1818

**Why add this?**: A repeated pattern is that an issue is fixed in the
card, a new build is released and users will incorrectly believe it's
not yet fixed due to their browser caching the old code. This results in
wasting their time, and my time.

**But it's obnoxious!**: I'm pretty sensitive to this (hence adding
these messages!), so let me know how terrible you find it. You can
disable it with:

```yaml
performance:
  features:
    card_loading_indicator: false
```

tests/config/profiles/low-performance.test.ts

@@ -42,6 +42,7 @@ it('should contain expected defaults', () => {
     'menu.buttons.timeline.enabled': false,
     'menu.style': 'outside',
     'performance.features.animated_progress_indicator': false,
+    'performance.features.card_loading_indicator': false,
     'performance.features.max_simultaneous_engine_requests': 1,
     'performance.features.media_chunk_size': 10,
     'performance.style.border_radius': false,

tests/config/types.test.ts

@@ -278,6 +278,7 @@ describe('config defaults', () => {
       performance: {
         features: {
           animated_progress_indicator: true,
+          card_loading_indicator: true,
           media_chunk_size: 50,
         },
         style: {