feat: offer timed opening and ending skips

TODO.md

@@ -21,5 +21,8 @@
     - we should strive to use modern and idiomatic SDKs and APIs including SwiftUI among others
     - audited SDK 27.0 / Swift 6.4 with the macOS 15 minimum retained; migrated Cast discovery to NWBrowser and production activation to activate(). Real Bonjour identity/name/update/order/deduplication/removal/restart and routable-endpoint checks, loopback Cast transitions, focused startup-error alerts and a cooperating-launcher production smoke for cold start/CLI reuse/document handoff/keyboard playback passed. The existing full CLI snapshot-harness timeout remains; macOS 15 runtime and physical-Cast verification remain unverified. Observation, glass and the existing native bridges were left unchanged.
 - [x] fix the readme. it's currently bloated with irrelevant implementation detail and other such nonsense. it should do the job of a readme only, nothing more.
-- [ ] add a skip button when current playback is inside either an opening or an ending segment.
-    - skip button should disappear within 3 seconds; if not clicked, the user probably wants to watch the segment.
+- [x] add a skip button when current playback is inside either an opening or an ending segment.
+    - Skip Opening/Ending uses validated metadata, seeks to the segment end and disappears after three seconds even while paused; ignored segments stay dismissed until close/media replacement. Native HLS, exact-EOF, controlled-clock dismissal and loopback Cast checks passed. Button placement and physical-Cast verification remain unverified; rapid play/seek probes encountered Core Audio startup errors on Bluetooth output.
+- [ ] improve: subtitles.
+    - decrease padding on captions
+    - decrease font size of captions by 10 percent