fix(design): an audit of the S3d claims — the float shadow, filter hints, one action size per row (E28 S3d)

- A glass role's shadow is one token (shadow-float); the header search's drop-shadow utility had
  replaced its top highlight, and the debug pill's shadow-lg did the same. The surface-role lint
  rule now refuses a shadow size beside a role.
- Plex: every value that filters carries a hint (genre, certificate, studio had none), and the facts
  panel's year and certificate filter like the header's. filterKeyword -> filterValue.
- Downloads: the row resized its buttons with a [&_button] override that the save link escaped
  (28px beside 32px); the size is the primitive's md rung now.

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

@@ -267,7 +267,7 @@
     "audience": "Audience",
     "keywords": "Keywords",
     "crew": "Crew",
-    "filterKeyword": "Filter by \"{{name}}\"",
+    "filterValue": "Filter by \"{{name}}\"",
     "facts": {
       "title": "Details",
       "release": "Released",

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

@@ -267,7 +267,7 @@
     "audience": "Közönség",
     "keywords": "Kulcsszavak",
     "crew": "Stáb",
-    "filterKeyword": "Szűrés erre: „{{name}}”",
+    "filterValue": "Szűrés erre: „{{name}}”",
     "facts": {
       "title": "Részletek",
       "release": "Megjelenés",