UserProfileProvider kept a second cache of the active user's audio/subtitle
defaults beside AccountPreferencesRepository, re-implemented the active
profile/connection listener wiring and Plex Home token resolution, and for
Plex Home profiles bypassed the shared cache entirely (fetching /user with
its own client), so a write in the Account preferences screen never reached
Home-profile playback.
The controller now resolves the active account (the head of its sorted
account list), loads it through the one repository on attach, on profile
switch, and when the account's token changes, and exposes it as
activePreferences; ensureActiveLoaded replaces initialize() for the startup
gate. Playback, offline waiting, and logout storage clearing read the
controller directly; UserProfileProvider, the per-backend user-profile DTOs,
PlexAuthService.getUserProfile, and JellyfinClient.fetchUserProfile are
deleted.
The ranked defaultAudioLanguages/defaultSubtitleLanguages lists go with
them: Plex Web never reads them, PMS applies them when it stamps `selected`
on streams, and Plezy already trusts that flag ahead of the profile. They
only refined a best-effort audio fallback for Plex items with no media
info, which the primary language covers; on that path a second preferred
language is no longer tried before the file's default track.
Plex Home profiles now read /user/profile with the switched token through
the same cache as local profiles.
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