The Jellyfin 10.10.3 web client reads DisplayPreferences with the client
name 'Jellyfin Web'. The legacy 'emby' value is read by older SDKs only —
so writing only to 'emby' (the original script) updates the DB but has no
visible effect on the web UI. The empty 'Jellyfin Web' doc falls back to
factory defaults that include Next Up.
Now patches all four per-client docs ('Jellyfin Web', 'emby', 'emby-mobile',
'emby-web') and ensures both Continue Watching (resume) and Latest Media
are present so blank users don't fall back to defaults.
Applied 2026-05-11 across prod (13 users x 4 clients) and dev (1x4).
Applied 2026-05-11 across both prod (13 users) and dev (1 user).
Replaces 'nextup' homesection slot with 'none' on every user; seeds 'resume'
at slot 0 for users whose CustomPrefs was empty (would have fallen back to
the Jellyfin factory default that includes Next Up).
Idempotent — re-running is a no-op once converged.
