fix(jellyfin): subtitle timing, resume progress, and overlay sync

- Add per-stream subtitle delay persistence and auto timeline-offset correction
- Strip server-selected subtitle stream from mpv load URL; suppress plugin subtitle rearm and auto-start during app-managed preload
- Fix resume position lost when mpv resets on stop; use last known position for final progress/stopped reports
- Keep Play vs Resume distinct to avoid early seek race on normal play
- Fix discovery resume when remote play sends StartPositionTicks=0 despite saved progress
- Deduplicate show/hide overlay commands using recorded visibility state
- Rewrite docs-site Jellyfin page around cast-to-device UX

changes/fix-jellyfin-discovery-resume.md

@@ -0,0 +1,4 @@
+type: fixed
+area: jellyfin
+
+- Fixed Jellyfin discovery resume playback when a remote play command sends `StartPositionTicks: 0` despite saved progress on the item.

changes/fix-jellyfin-subtitle-timing.md

@@ -0,0 +1,4 @@
+type: fixed
+area: jellyfin
+
+- Improved Jellyfin subtitle timing behavior by preferring default embedded subtitle streams over external sidecars, stripping Jellyfin's server-selected subtitle stream from mpv playback URLs, suppressing mpv's subtitle auto-selection and plugin overlay auto-start while SubMiner stages managed tracks, automatically correcting clear Japanese-vs-English cue timeline offsets, and restoring saved per-stream subtitle delay shifts.

changes/fix-jellyfin-visible-progress.md

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+type: fixed
+area: jellyfin
+
+- Preserved Jellyfin-visible resume progress when mpv resets its position during playback stop by reusing SubMiner's last known playback position for final progress and stopped reports.
+- Kept Jellyfin remote Play and Resume distinct so normal Play starts from the beginning, while Resume starts at Jellyfin's requested position without an early mpv seek race.