style: segment playback timeline with rounded gaps

README.md

@@ -23,7 +23,7 @@ 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; **+** 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 a supported link. YouTube supports individual videos, not playlists or channels. Miruro links must use `https://barelystarted.miruro.tv/watch/<opaque-id>/<slug>?ep=<episode>` with an explicit positive episode number; arbitrary streaming sites are not supported.
-- **Miruro metadata:** titles and labeled Opening/Ending bands load independently of playback when available. Bands use measured media duration; missing/invalid metadata leaves playback usable. Timings may differ between cuts. No automatic skipping is performed.
+- **Miruro metadata:** titles and opening/ending intervals load independently of playback when available. Small rounded gaps mark interval boundaries in the slider, without visible labels; accessibility descriptions retain the interval names and times. Missing/invalid metadata leaves playback usable. Timings may differ between cuts. No automatic skipping is performed.
 - **Resume:** videos resume their saved position; finished videos restart from the beginning. Live and audio-only media do not save progress.
 - **Compact mode:** press **P** for a floating player; double-click it to restore. Drag noninteractive areas to move the window. Use the titlebar pin to keep the normal window on top.
 - **Quality:** YouTube defaults to SDR up to 1080p. Use **gear → Quality** for other available resolutions or automatic quality.