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/live-provider.scss

@@ -1,9 +1,7 @@
+@use 'basic-block.scss';
 @use 'media-background.scss';
 
 :host {
-  display: block;
-  height: 100%;
-  width: 100%;
   position: relative;
 }