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/plexViews.tsx

@@ -397,6 +397,7 @@ export function PlexShowView({
             <div className="mt-1 flex flex-wrap items-center gap-x-2 gap-y-0.5 text-sm text-muted">
               {show.year != null && (
                 <Filterable
+                  title={onFilter ? t("plex.info.filterYear", { year: show.year }) : undefined}
                   onClick={
                     onFilter
                       ? () => onFilter({ yearMin: show.year, yearMax: show.year })
@@ -407,15 +408,18 @@ export function PlexShowView({
                 </Filterable>
               )}
               {show.content_rating && (
-                <Filterable
-                  onClick={
-                    onFilter
-                      ? () => onFilter({ contentRatings: [show.content_rating!] })
-                      : undefined
-                  }
-                >
-                  · {show.content_rating}
-                </Filterable>
+                <span>
+                  ·{" "}
+                  <Filterable
+                    onClick={
+                      onFilter
+                        ? () => onFilter({ contentRatings: [show.content_rating!] })
+                        : undefined
+                    }
+                  >
+                    {show.content_rating}
+                  </Filterable>
+                </span>
               )}
               {show.season_count != null && (
                 <span>· {t("plex.seasons", { count: show.season_count })}</span>
@@ -432,6 +436,9 @@ export function PlexShowView({
                     onClick={
                       onFilter ? () => onFilter({ ratingMin: Math.floor(score) }) : undefined
                     }
+                    title={
+                      onFilter ? t("plex.info.filterRating", { n: Math.floor(score) }) : undefined
+                    }
                     className={`inline-flex items-center gap-1 ${onFilter ? "cursor-pointer hover:text-accent" : "cursor-default"}`}
                   >
                     {/* decorative rating gold — intentionally NOT a status token */}