feat(player): wire chapter UI into native player controls

Threads chapters + duration through Controls -> BottomControls so the
ChapterTicks overlay, ChapterList modal and current-chapter label have
the data they need.

BottomControls

- Memoizes chapterMarkerList (markers within the media duration) once
  per (chapters, durationMs) change and feeds it to ChapterTicks.
- hasChapters gates the bookmark icon + list modal; nothing renders
  when chapters are missing or below two real markers.
- Current chapter name shown as a small label below the title/year
  during playback; the same helper feeds the trickplay bubble while
  scrubbing. Both labels disappear gracefully when chapters are absent.

useVideoSlider

- Adds seekTo(value): a programmatic seek for non-gesture entry points
  (chapter list, hot-keys). Reads isPlaying directly instead of
  wasPlayingRef — which is only populated inside handleSliderStart, so
  a tap-to-seek on the chapter list previously either stranded paused
  playback or auto-resumed against a manual pause.

TrickplayBubble

- Adds an optional chapterName prop; renders a small left-aligned
  overlay inside the preview frame (Jellyfin web style) showing chapter
  name above the timestamp. Hides the chapter line entirely when null.
- zIndex + elevation so the bubble lands in front of the title /
  surrounding overlays.
- Slight reposition (bottom -20, paddingTop 12) brings the bubble
  closer to the slider.

translations/en.json

- chapters.title / chapters.chapter_number / chapters.open /
  chapters.close keys for the list modal and the bookmark a11y label.

components/video-player/controls/hooks/useVideoSlider.ts

@@ -74,6 +74,21 @@ export function useVideoSlider({
     [seek, play, progress, isSeeking],
   );
 
+  // Programmatic seek (chapter list, hotkeys) that bypasses the slide gesture.
+  // Reads `isPlaying` directly instead of `wasPlayingRef`, which is only set
+  // during a real slide and would carry stale state on a tap-to-seek.
+  const seekTo = useCallback(
+    (value: number) => {
+      const seekValue = Math.max(0, Math.floor(value));
+      progress.value = seekValue;
+      seek(seekValue);
+      if (isPlaying) {
+        play();
+      }
+    },
+    [seek, play, progress, isPlaying],
+  );
+
   const handleSliderChange = useCallback(
     debounce((value: number) => {
       // Convert ms to ticks for trickplay
@@ -96,5 +111,6 @@ export function useVideoSlider({
     handleTouchEnd,
     handleSliderComplete,
     handleSliderChange,
+    seekTo,
   };
 }