Restructure the dashboard into a two-column layout: a wide main column
holding the new Playlist Overview card, and a narrow (220px) right
sidebar with the compacted Quick Actions and Workflow Guide cards.
The Overview card answers "which playlist should I add media to, and
who will see it?" without opening each playlist. Per playlist it shows:
- name, linked to that playlist's content manager
- item count, total duration and current version
- "N/M online" coverage, or a "no players" warning
- one chip per assigned player, with an online/offline dot, linking
to that player's manage page
- an explicit empty state when no player is assigned
Players with no playlist are surfaced in a separate warning, since they
silently display nothing.
main.py builds this in a fixed number of queries: players are fetched
once and grouped by playlist_id, rather than calling
Playlist.players per row (which would be one query per playlist).
Layout notes:
- minmax(0, 1fr) on the main column so long names cannot widen the grid
- sidebar is sticky on tall screens and collapses below the main column
under 900px, where the two small cards sit side by side
- sidebar cards used the global .card hover lift; suppressed for these
Also fixes a corrupted emoji (U+FFFD) in the System Status card.
Verified at 1600/1200/950/850/600px: no overflow, no button label
wrapping, and correct dark-mode colours.
ske087
84b5cd3d48