Replace the per-tracker json_serializable session classes and account stores with a shared TrackerSession (service-aware persisted validation), a single TrackerAccountStore, a shared TrackerHttpClient, and an AnimeListTrackerBase mixin for MAL/AniList. Scope the per-service rebind guard so a disconnect can't abort a racing profile load. Add migration-safety, MAL refresh, episode-count cache, and content-type tests.
The aired-order rework can sweep correctly-placed Specials into "download
next N"; this toggle lets users opt out. Shown only for whole shows
(reusing FocusableSwitchListTile via an optional toggle on the shared
option-picker dialog), remembered across opens via a BoolPref
(default on = unchanged behavior). Filters Specials at the single
collect choke point (_collectPlayable), with a guard so explicitly
downloading the Specials season still queues its episodes.
Discover and libraries now fetch only the servers that came online since
the last pass and merge the results; already-loaded servers are not
refetched. Both providers also own their online-servers listener
(registered in the constructor, removed in dispose), so profile switches
no longer leak listeners that kept disposed providers refetching.
Adds context.withFreshWatchState/readFreshWatchState and sweeps the
remaining session-critical readers: context menu actions, folder tree
rows, discover hero, and TV spotlight minutes-left.
Resolution now considers parentChain ancestors (newest event wins) and
watched patches set container leaf counts, so container marks reach
descendant cards and vice versa.
Rounding the smoothed per-episode progress could fill the ring to 100% while a download was still finishing; only report 100% once every queued episode is complete. Also drop the stale episode-count diagnostic log that read leafCount/_totalEpisodeCounts solely for logging after the denominator change.
Progress ring now measures completion against the episodes actually queued (episodes.length) instead of the show's full leafCount, and advances smoothly using per-episode progress. The completed show/season download button reopens the download-options dialog (with a Delete row) so users can fetch more episodes or switch to sync instead of only deleting.
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