test: cover markdown-html filter and media-player selector

Two real-logic gaps from the refreshed coverage backlog. cj/markdown-html (markdown-config) is the impatient-mode filter that wraps a source buffer's text in the strapdown HTML shell — tested for normal content and an empty buffer. cj/select-media-player (media-utils) was the one untested function there — tested that choosing an available player updates cj/default-media-player and that a non-matching selection leaves it unchanged. Both mock at the boundary (completing-read, the source buffer).

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