add logo and proper icon, update @icon refs

logo.jpg displays at the top of README.md. gd-dynamic-sound-icon.jpg replaces
the icon.svg placeholder for the @icon decorator on all six player wrappers
plus the DynamicSound and DynamicSoundPlaylist resources.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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