docs(specs): add fancy music-player UI spec + prototype (DRAFT)

A spec for the hi-fi look Craig picked from the prototype: the EMMS playlist buffer gains names instead of stream URLs, cover art, a serif now-playing hero with a progress bar, and a warm amber palette, degrading to plain text in a terminal frame.

I verified the cover-art path is reachable (radio-browser stations carry a favicon URL, retrievable at search time or by UUID) and framed the work as three layers: a name and text base that ships value on its own and doubles as the terminal fallback, cover-art fetch and cache, then the fancy GUI render. Five design decisions are open, each with a recommended call.

The three-direction prototype (minimal, fancy, modern) lands beside the spec as its companion.

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