On mobile data the single default streaming quality either burns
through the user's data plan or permanently caps quality at home.
Playback start now applies a dedicated cellular default when the
device is on a cellular-only connection, read from the app's existing
single connectivity subscription. The new setting defaults to
following the general default, ships in Settings > Playback for
phones/tablets only, and explicit per-play quality picks still win.
'Metered connection' had been spelled out independently in the offline
provider, the download WiFi-only gate and the sync-rule cooldown.
Rather than add a fourth copy, all four now share
ConnectivityLinkType. Network *presence* is deliberately left alone:
its callers disagree on whether an empty snapshot counts as
connected, so folding that in would change behavior.
showSelectionDialog now returns the picked DialogOption instead of its
raw value so the tile's null-valued 'Same as Default Quality' option
stays distinguishable from dismissing the dialog.
close#2147
Preferences that belong to the media-server account had nowhere to live in Plezy. Jellyfin keeps a user's audio/subtitle language, subtitle mode and several library options in `UserConfiguration`; plex.tv keeps the same language choices plus watched indicators and review visibility on the account. Plezy read four of those fields for auto-track selection and could never show or change any of them.
Adds an Account preferences section under Connections. One account edits in place; several show a picker first, scoped to the active profile's own connections so a managed Plex Home user never edits the owner's record. Every row is gated on what the backend can actually store.
It also moves "rewatching in Next Up" onto the account. There is no `UserConfiguration` field for it, but the per-user `DisplayPreferences` store is keyed `(userId, displayPreferencesId, client)` with no device component, so the switch goes there and follows the account.
`AccountRef` keys by account, not `clientScopeId`: MediaBrowser is `{machineId}/{userId}`, Plex is (account, Home user). Writes are patch-shaped because both backends replace whole objects — Jellyfin's `POST /Users/{id}/Configuration` and its `DisplayPreferences` row both reset omitted fields, so each write re-reads, merges only the patched keys, and posts back. Plex takes its changes as query parameters with an empty body, and its `experience` blob and the PMS `/accounts/1` mirror are deliberately untouched.
`AccountPreferencesController` owns a single repository above the profile session, so changing a language in settings reaches the next playback without a restart. Emby is gated out of rewatching through `MediaBrowserDialect.supportsNextUpRewatching`.
close#1910
edde746