Trim offered playback speeds to 1x, 1.1x, 1.25x, 2x

1.1 and 1.25 cover the gap 1x leaves and 2x is the fastest speech
stays easy to follow at; 1.5x and 1.75x are dropped. A show, episode
or rule speed stored before this change keeps playing at its old
value -- the speed pickers just don't highlight a chip for it, same
as any value typed outside the list already worked. speedLabel() is
made internal and covered by a test; Float.toString() already
formats 1.1x correctly on the JVM, so no formatting fix was needed.

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

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