Reconcile segment-skip with the diverged-but-ahead version on the
chromecast refactor branch:
- useSegmentSkipper: track auto-skip by segment identity instead of a
bool, so it no longer re-triggers on pause/unpause; guard skipMode
"none"; use a finite totalDuration check for Outro.
- Controls: playingRef avoids a stale-closure resume after a seek; only
resume playback if it was actually playing; skipCredit noop fallback.
- segments: drop the dead try/catch around Promise.allSettled.
- Remove the obsolete useIntroSkipper / useCreditSkipper hooks (177 dead
lines, superseded by useSegmentSkipper).
- Add SegmentSkipMode type ('none', 'ask', 'auto') in settings.ts
- Create 5 segment skip settings: skipIntro, skipOutro, skipRecap, skipCommercial, skipPreview
- Update segments.ts to fetch all 5 segment types from Jellyfin MediaSegments API (10.11+)
- Create unified useSegmentSkipper hook supporting all segment types with 3 modes
- Update video player Controls.tsx with priority system (Commercial > Recap > Intro > Preview > Outro)
- Add dynamic skip button text in BottomControls.tsx
- Create dedicated settings submenu at settings/segment-skip/page.tsx
- Simplify PlaybackControlsSettings.tsx with navigation to submenu
- Extend DownloadedItem interface with all segment types for offline support
- Add 13+ translation keys for segment skip UI
