Turning auto-skip off still surfaced a skip button on every intro and
credits marker, so a viewer who wants to watch episodes in full had no
way to silence it. The two auto-skip switches become per-marker
selectors — Off, Show button, Automatic — stored as skip_intro_mode and
skip_credits_mode. Off filters the marker before it becomes current, so
the player behaves as if the server had sent none: no prompt, no
countdown, no TV autofocus, and Back reaches the screen. Flipping a kind
to Off while its prompt is up drops the prompt immediately.
The legacy auto_skip_intro/auto_skip_credits booleans migrate on first
read: true becomes Automatic, false becomes Show button, matching what
each meant before.
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