🐛(frontend) fix svg icons import on videoplayer control bar

Since the Vite upgrade from 5.4.9 to 6.0.1, the download, transcript and shared
media icons were missing from the video player control bar on the standalone
site.
Based on the Vite documentation (https://vite.dev/guide/assets), when inlining
SVGs through url(), the variable needs to be wrapped within double quotes.

Author: wilbrdt

CHANGELOG.md

@@ -8,6 +8,10 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+### Fixed
+
+- Restore download, transcription and shared media icons on the video player 
+
 ## [5.6.0] - 2025-03-06
 
 ### Added

src/frontend/packages/lib_video/src/components/common/VideoPlayer/index.tsx

@@ -39,19 +39,19 @@ export const StyledBox = styled(Box)`
   }
 
   .vjs-icon-download {
-    background-image: url(${DownloadIcon});
+    background-image: url(\"${DownloadIcon}\");
     background-repeat: no-repeat;
     background-position: center;
   }
 
   .vjs-icon-transcript {
-    background-image: url(${TranscriptIcon});
+    background-image: url(\"${TranscriptIcon}\");
     background-repeat: no-repeat;
     background-position: center;
   }
 
   .vjs-icon-shared-media {
-    background-image: url(${SharedMediaIcon});
+    background-image: url(\"${SharedMediaIcon}\");
     background-repeat: no-repeat;
     background-position: center;
   }