fix: Increase reliability of media auto actions (e.g. play) (#1934)

Refactors media player handling entirely to make the code more
consistent and less boilerplate. Add testing for media player actions.

- Closes #1921
- Closes #1916

src/scss/video-player.scss

@@ -0,0 +1,10 @@
+@use 'basic-block.scss';
+@use 'media-layout.scss';
+
+video {
+  width: 100%;
+  height: 100%;
+  display: block;
+
+  @include media-layout.media-layout();
+}