feat(design): a Plex title's one action list (C1) — the poster's "…", details and the pin in its menu (E28 S3e2)

Every Plex poster list (library, Discover rails, person, show, season, collection, Home's rails)
now opens one menu per list from the right-click, the long-press, Shift+F10 and the card's "…":
play/open, watched, add to playlist, media info, copy title, the pin (usePlexCardActions +
PlexMenu, replacing the pin-only PlexPinMenu). The card keeps its state at rest and shows
watched / add to playlist / "…" on its picture on hover (ui/reveal.ts, shared with the video
card); on touch the toggles are gone and a 44px "…" sits beside the title, while the watched pill
stays. The hover ⓘ left the card; an episode's add button moved from its caption to the hover
row. Seasons get their own short menu (open, watched, add, copy), labelled "Open season" (the
card's overlay said "Open show"). Related shows are ordinary poster cards now. A collection's
admin "Remove" X moved into its menu, still behind the confirmation. The collection grid is two
columns on a phone. The unused .reveal-idle rule is gone.

frontend/src/i18n/locales/en/plex.json

@@ -122,6 +122,7 @@
   "play": "Play",
   "resume": "Resume",
   "openShow": "Open show",
+  "menu": "Media",
   "markWatched": "Mark watched",
   "markUnwatched": "Mark unwatched",
   "watchedFailed": "Couldn't update the watched state — please try again.",
@@ -140,6 +141,7 @@
     "markShowUnwatched": "Mark show unwatched",
     "markSeasonWatched": "Mark season watched",
     "markSeasonUnwatched": "Mark season unwatched",
+    "openSeason": "Open season",
     "addShowCollection": "Add to collection"
   },
   "collEditor": {

frontend/src/i18n/locales/hu/plex.json

@@ -122,6 +122,7 @@
   "play": "Lejátszás",
   "resume": "Folytatás",
   "openShow": "Sorozat megnyitása",
+  "menu": "Média",
   "markWatched": "Megnézettnek jelöl",
   "markUnwatched": "Nem-nézettnek jelöl",
   "watchedFailed": "Nem sikerült frissíteni a megnézett állapotot — próbáld újra.",
@@ -140,6 +141,7 @@
     "markShowUnwatched": "Sorozat jelölés visszavonása",
     "markSeasonWatched": "Egész évad megnézve",
     "markSeasonUnwatched": "Évad jelölés visszavonása",
+    "openSeason": "Évad megnyitása",
     "addShowCollection": "Kollekcióhoz adás"
   },
   "collEditor": {