polish(plex): match the feed rail's segmented-pill look for the any/all toggle

The genre + actor MATCH toggles were a boxed button row (rounded-lg border, no
track); restyle them as the feed rail's tag-match toggle — a rounded-full track
(border + bg-card + p-0.5) with an inset rounded-full active pill, plus a MATCH
label. Extracted a shared MatchToggle so both read identically. i18n
plex.filter.matchLabel (en/hu). (Plex cast-explore polish)

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

@@ -57,7 +57,8 @@
     },
     "collection": "Collection",
     "collectionSearch": "Search collections…",
-    "collectionEmpty": "No collections"
+    "collectionEmpty": "No collections",
+    "matchLabel": "Match"
   },
   "count": "{{count}} titles",
   "searchCount": "{{count}} matches",

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

@@ -57,7 +57,8 @@
     },
     "collection": "Kollekció",
     "collectionSearch": "Kollekciók keresése…",
-    "collectionEmpty": "Nincs kollekció"
+    "collectionEmpty": "Nincs kollekció",
+    "matchLabel": "Egyezés"
   },
   "count": "{{count}} cím",
   "searchCount": "{{count}} találat",