feat(jellyfin): big-screen theme for the TV, mounted into the wmc slot

dankserver/jellyfin/quadlet/jellyfin.container

@@ -47,6 +47,12 @@ Volume=/home/dank/Containers/jellyfin/cache:/cache
 # is the guard: started against a plain, unmounted view directory a scan decides
 # the library is empty and deletes what it cannot see.
 Volume=/var/lib/media-meta/view:/data
+# Big-screen theme for the TV. The repo file replaces the container's "Media
+# Center" theme slot; the upstream dark palette stays live because the file
+# @imports it, so an image bump cannot strand a vendored CSS snapshot. Read-only
+# — the web app only fetches it. A client opts in with
+# Display Settings -> Theme -> "Media Center".
+Volume=/home/dank/serverAppConfigs/dankserver/jellyfin/theme/wmc/theme.css:/jellyfin/jellyfin-web/themes/wmc/theme.css:ro
 AddDevice=/dev/dri
 GroupAdd=keep-groups
 HealthCmd=curl -f http://localhost:8096/health