feat(music): tag completion, aligned listings, numbered playlist rows

The radio tag search now completes over popular tags from radio-browser's /json/tags endpoint (station-count order, capped at 500, cached per session), so the prompt offers real tags instead of a blind guess. Free-form input still works, and a failed fetch degrades to plain input.

Station listings align into columns: the votes field pads to a fixed width, and each annotation pads out to the widest candidate name.

Playlist rows carry a numeric overlay prefix, rebuilt after every change by a debounced after-change hook, so the cursor stays visible on cover-art thumbnails and each row's position is readable. Overlays leave the buffer text to EMMS.

Also fixed: the search now trims queries before they hit the API (a trailing space used to reach it as %20 and match nothing).

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