Add live introdb key reload and recap playback markers

- reload introdb API key on setting updates
- support recap/preview markers in playback and next-episode flow
- add profile defaults for recap and preview auto-play settings

web/src/player/components/IntroSkipButton.tsx

@@ -1,18 +1,19 @@
 interface IntroSkipButtonProps {
   onSkip: () => void;
+  label?: string;
 }
 
 /**
  * "Skip Intro" button visible during the intro time range.
  */
-export function IntroSkipButton({ onSkip }: IntroSkipButtonProps) {
+export function IntroSkipButton({ onSkip, label = "Skip Intro" }: IntroSkipButtonProps) {
   return (
     <button
       onClick={onSkip}
       type="button"
       className="absolute right-6 bottom-24 z-50 rounded border border-white/40 bg-black/70 px-6 py-2 text-sm font-medium text-white transition-colors hover:bg-white/20"
     >
-      Skip Intro
+      {label}
     </button>
   );
 }