#4 acquisition progress: a thin done÷wanted bar across each bubble's bottom
(forward-prep — fills once the download engine lands).
Expanded-view richness: episodes now carry a still thumbnail. New video_wishlist
.still_url column (SCHEMA_VERSION 10 + migration); the get-modal captures the
still per episode (owned -> /poster/episode proxy, tmdb -> direct still_url) and
sends it through add; query_wishlist returns it; the episode row renders a 16:9
thumb (film-frame placeholder when absent) in a roomier expanded tile.
Subtle video identity: the bubbles are now rounded-SQUARES (the music orbs stay
circles). Every rule stays scoped under .vwsh-nebula — verified no bare .wl-*
rules in the video CSS, so the music wishlist is untouched.
Tests: +1 (still roundtrip). Backend 102 passed.
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