fix(explore): size catalog detail relations, ratings and facts to their content

Four sections of the catalog detail screen spent more room than their data
justified.

Franchise relations drew one hub shelf per label. Real payloads make that
absurd: MAL returns twelve relations for Attack on Titan across six labels,
and "Side story" and "Sequel" each hold exactly one title, so each spent a
header, a scroll row and one card. Flatten the labelled groups into one
"Related titles" section of compact rows — poster thumb, label, title and year
— that flow into columns on wide viewports. D-pad moves through the grid by
index and still hands off to the cast strip above and the recommendations
shelf below, which keeps its shelf because taste-based recommendations are
meant to be browsed.

Drop the MAL picture gallery. It was a horizontal strip of unfocusable poster
variants of the title you are already looking at, and it cost a page-height of
scroll; the `pictures` field comes back out of the detail request with it.

Draw attributed scores behind their own brand mark where the source has one,
the way the media detail screen already does: Rotten Tomatoes fresh/rotten and
upright/spilled, IMDb and TMDB, each on the scale that source publishes.
Sources with no mark (critic, audience, tracker scores) keep their written
label. Plex's own badge state is derived from the 60% tomatometer threshold it
encodes in `image.rating.ripe`.

Flow the definition rows — original title, studios, country, budget, box
office, crew — into two or three columns once the window is wide enough.
A 1440-wide window drew a 140-pixel label, a short value and 1,000 pixels of
nothing per fact.

Verified against live MAL and Plex Discover payloads on macOS: the Attack on
Titan page drops from 4,082 to 2,115 logical pixels, Dune: Part Two from 1,282
to 1,154.

lib/i18n/en.i18n.json

@@ -1147,7 +1147,7 @@
       "favoritedBy": "Favorited by ${who}",
       "unairedEpisodes": "${n} not aired yet",
       "recommendedByPercent": "Recommended by ${percent} of viewers",
-      "gallery": "Gallery",
+      "relatedTitles": "Related titles",
       "background": "Background"
     },
     "totalResults": {