Add a "this is an ad" button to the notification

The notification carried four buttons doing two jobs: Media3's default
previous/next (which PodcastPlayer redefines as seek) plus our own
back-15/forward-25 pair. Media button preferences with explicit slots
let the custom pair claim the two seek slots, so the duplicates go and
the freed space carries "this is an ad". No player command is removed
to achieve it, which is the route that once silently killed the
headphone skip button.

One press means four things, told apart by where the playhead lands
rather than by guessing: press claims advertising from here and jumps
past it, pressing again extends the same claim, coming back inside the
jump moves its end to where you landed, and coming back past the press
withdraws it. Outside a 20-second window a seek is ordinary navigation
and says nothing. The window is stored with the label so changing it
later cannot reinterpret old data.

Every backwards seek feeds the gesture, whatever caused it --
notification, headphone remote, in-app bar, dragged slider -- because
you correct with whatever is to hand.

This is the opposite evidence to the tap-a-break popup. That one can
only correct breaks detection already found, and detection accounts for
about 38% of the advertising the feeds imply.

Verified on the emulator: the notification now shows exactly back-15,
pause, forward-25 and the new button; the lock screen shows it too and
pressing it there records a claim without unlocking; all four gesture
arms behave as specified; and the media transport keys still seek by
25s and 15s. Android Auto still needs the car.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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