Polish mobile layouts, extract ExpandableText, fix image sizing

- Stack title-hero poster/metadata vertically on mobile (flex-col md:flex-row),
  switch backdrop tall breakpoint from sm to md
- Extract bio expand/collapse logic into reusable ExpandableText component;
  use it in PersonHero and TitleHero
- Fix ContinueWatchingCard image to use fill + sizes instead of fixed
  width/height to avoid layout shift
- Add fade-out gradient on genre chip scrollbar edge on mobile
- Show scaled-down ambient glow on mobile instead of hiding it entirely
- Humanize knownForDepartment labels (Acting→Actor, Directing→Director, etc.)
- Change cast member name from truncate to line-clamp-2 for wrapping
- Hide tooltip arrow via [&>:last-child]:hidden instead of color-matching it
- Apply safe-area-inset padding to HeroBanner content on notched devices

components/ui/card.tsx

@@ -12,7 +12,7 @@ function Card({
       data-slot="card"
       data-size={size}
       className={cn(
-        "ring-foreground/10 bg-card text-card-foreground group/card flex flex-col gap-4 overflow-hidden rounded-lg py-4 text-xs/relaxed ring-1 has-[>img:first-child]:pt-0 data-[size=sm]:gap-3 data-[size=sm]:py-3 *:[img:first-child]:rounded-t-lg *:[img:last-child]:rounded-b-lg",
+        "group/card flex flex-col gap-4 overflow-hidden rounded-lg bg-card py-4 text-card-foreground text-xs/relaxed ring-1 ring-foreground/10 has-[>img:first-child]:pt-0 data-[size=sm]:gap-3 data-[size=sm]:py-3 *:[img:first-child]:rounded-t-lg *:[img:last-child]:rounded-b-lg",
         className,
       )}
       {...props}
@@ -25,7 +25,7 @@ function CardHeader({ className, ...props }: React.ComponentProps<"div">) {
     <div
       data-slot="card-header"
       className={cn(
-        "group/card-header @container/card-header grid auto-rows-min items-start gap-1 rounded-t-lg px-4 group-data-[size=sm]/card:px-3 has-data-[slot=card-action]:grid-cols-[1fr_auto] has-data-[slot=card-description]:grid-rows-[auto_auto] [.border-b]:pb-4 group-data-[size=sm]/card:[.border-b]:pb-3",
+        "group/card-header @container/card-header grid auto-rows-min items-start gap-1 rounded-t-lg px-4 has-data-[slot=card-action]:grid-cols-[1fr_auto] has-data-[slot=card-description]:grid-rows-[auto_auto] group-data-[size=sm]/card:px-3 [.border-b]:pb-4 group-data-[size=sm]/card:[.border-b]:pb-3",
         className,
       )}
       {...props}
@@ -37,7 +37,7 @@ function CardTitle({ className, ...props }: React.ComponentProps<"div">) {
   return (
     <div
       data-slot="card-title"
-      className={cn("text-sm font-medium", className)}
+      className={cn("font-medium text-sm", className)}
       {...props}
     />
   );