Fixes the expanded-show design from the screenshot:
- The header is now a 3-column row that flanks the poster: synopsis left, poster
middle, cast right — using the wasted horizontal space instead of stacking
everything vertically and pushing episodes down. Each side column hides (:empty)
when there's nothing, so a collapsed bubble or a cast-less reality show just
shows the centered poster (nebula grid unchanged). Stacks on mobile.
- Quiet episode-still placeholder (faint icon) instead of loud diagonal stripes
for episodes TMDB has no still for.
All scoped under .vwsh-nebula; music wishlist untouched.
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