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/components/plexDetailUi.tsx

@@ -22,8 +22,9 @@ import { Chip } from "./ui/Chip";
 // customize menu that toggles them. The prefs hook, backdrop helpers and epLabel live in plexDetail.ts.
 
 // A metadata value that filters the grid when clicked (if onClick is wired), else plain text. Shared
-// by the movie info page (PlexInfo) and the unified grid / show pages (PlexBrowse). The optional
-// `title` gives a hover hint (e.g. "Filter by 1998"); callers that don't need it just omit it.
+// by the movie info page (PlexInfo) and the unified grid / show pages (PlexBrowse). A filtering value
+// always says so on hover: `title` is a caller's specific hint ("Show titles from 1998"), else the
+// generic "Filter by …" from the value's own text.
 export function Filterable({
   onClick,
   title,
@@ -41,9 +42,15 @@ export function Filterable({
   onDark?: boolean;
   children: ReactNode;
 }) {
+  const { t } = useTranslation();
+  const hint =
+    title ??
+    (onClick && (typeof children === "string" || typeof children === "number")
+      ? t("plex.info.filterValue", { name: children })
+      : undefined);
   if (tag)
     return onClick ? (
-      <Chip variant="token" onClick={onClick} title={title}>
+      <Chip variant="token" onClick={onClick} title={hint}>
         {children}
       </Chip>
     ) : (
@@ -53,7 +60,7 @@ export function Filterable({
   return (
     <Pressable
       onClick={onClick}
-      title={title}
+      title={hint}
       className={`${className ?? ""} cursor-pointer hover:text-accent transition`}
     >
       {children}