feat: animate hovered chapter titles and active seek segments

README.md

@@ -24,7 +24,7 @@ To run without installing, use `make run`. The built `.build/terebi.app` is self
 - **Local files:** use **⌘O**, drag files onto the player, or choose Finder's **Open With**. Multiple files form a queue in natural filename order, with automatic advance. Use **View → Show Queue** to play, reorder or remove items; **+ → file icon** or dropping files onto the sidebar appends them. The queue lasts only for the session; opening other media replaces it.
 - **Streams:** use **Open Stream…** (**⇧⌘O**) or drop an HTTP(S) video link. To append without replacing playback, press the sidebar's **+**, then the **link icon**: the URL field opens upwards; **Return** fetches and adds the video. The link icon toggles the field; **Esc** dismisses it and cancels a pending fetch. Fetch errors leave the queue unchanged. Links are passed to the bundled yt-dlp without a site allowlist; extraction must return a single streamable video, not a playlist or channel. Miruro keeps its dedicated resolver: links must use `https://barelystarted.miruro.tv/watch/<opaque-id>/<slug>?ep=<episode>` with an explicit positive episode number.
 - **Stream queues:** integrations can supply an ordered yt-dlp/Miruro queue with `--new-instance --queue-file /absolute/queue.json`, or append without interrupting the running player using `--enqueue --queue-file /absolute/queue.json` (also for a single item). Enqueue starts playback if the player is empty or not running. The same sidebar supports play, reorder, remove, previous/next and automatic advance. Unresolved titles, including the selected row, load serially at lower priority without waiting for playback loading, buffering or quality extraction. YouTube uses a title-only oEmbed request; other sites use yt-dlp metadata and Miruro uses optional episode metadata. Arrival still depends on the site/network; failed lookups retain the supplied label, and full playback metadata takes precedence. Playback sources still resolve fresh when selected or revisited; local-file batches still use natural filename order. yt-dlp items use the original page URL for resume and version-1 progress reports; recognized YouTube video URLs still canonicalize.
-- **Seeking:** click or drag the progress track or thumb to seek. The thumb centers on the cursor, clamped to the track endpoints.
+- **Seeking:** click or drag the progress track or thumb to seek. The thumb centers on the cursor, clamped to the track endpoints. While mouse-seeking, the segment under the thumb smoothly thickens and returns to normal on release. Hovering a named segment fades its title in above the segment's center. Reduce Motion disables these transitions.
 - **YouTube chapters:** when yt-dlp provides usable chapters, small rounded gaps mark their boundaries in the playback track. Boundaries use the current player's duration; missing or malformed chapter data leaves ordinary playback unchanged. Chapters do not add opening/ending skip buttons. Availability varies, and description-derived timestamps may differ from YouTube's displayed chapters.
 - **Miruro metadata:** titles and opening/ending intervals load independently of playback when available. Small rounded gaps mark interval boundaries in the slider. Inside a segment, **Skip Opening** or **Skip Ending** appears at the top-right below the titlebar for up to ten seconds or until the segment ends; clicking seeks to its end. A light background fill grows as the offer expires, with a short entrance/exit transition; Reduce Motion uses stepped countdown updates without the transition. Ignored offers stay dismissed until the media is closed or replaced. Missing/invalid metadata leaves playback usable, and timings may differ between cuts. Nothing skips automatically.
 - **Resume:** videos resume their saved position; finished videos restart from the beginning. Live and audio-only media do not save progress.