feat(details): put the age certification in a rounded chip

[ReichiMD]

What

The age certification on the movie and show details screens is now shown in a
small rounded chip instead of plain text in the metadata row, so it reads as a
certification rather than as one more number next to the runtime. The hero
preview on the TV home screen shows it too — it had the data available but was
not displaying it.

How

• Reuses the existing "In Cinema" pill pattern from the details screen: Box +
  RoundedCornerShape(6.dp) + padding(horizontal 10.dp, vertical 4.dp), moved to
  ui/components/ContentRatingChip.kt so both screens share one definition.
• Neutral translucent background, no colour coding by age — deliberately, see
  below.
• Details screen: applied to both layouts (phone and TV). The separator in front
  of the certification is dropped; the chip separates itself.
• TV home screen hero: the certification is carried through HeroDetailsSnapshot,
  which already holds the runtime, IMDb rating and budget from the same details
  call — so this costs no additional request.

Notes for review

• No new strings, no changes to the certification logic or the TMDB models —
  presentation only, apart from the one field added to the hero snapshot.
• On TV the details metadata row has a fixed width and the genre text ellipsises;
  the chip takes slightly more room than the plain text did. Checked on a TCL C7K.

Deliberately not included

• No colour by age rating: the age is only unambiguous for a few numeric systems
  (FSK, BBFC, ClassInd, ACB, Kijkwijzer) and would have to be guessed for
  letter-based ones (R, PG-13, TV-MA). A wrong colour is worse than none.
• Not shown in the phone home carousel: its cards come straight from the category
  rows and carry no certification, so it would mean a details request per card.
  On the phone the certification is on the details screen.
• No conversion of the remaining metadata (genre, year, runtime) to chips.
• No skin/theme tokens.

Testing

Built as a sideload debug APK and installed on a phone and on a TCL C7K
(Android TV). Existing unit tests unchanged and green.

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created by Claude (Anthropic) on behalf of @ReichiMD

[Himanth-reddy]

I like the idea of making the certification more distinct, but I don't think the current chip quite sits right with the existing UI. The metadata row currently has a pretty clean and consistent rhythm with the rating, year and runtime separated by dots, and the chip makes the certification feel a bit visually heavier than the rest. I think it might be worth exploring a treatment that gives the certification some distinction without introducing a full pill/chip into the metadata row.

[ProdigyV21]

I agree with himmanth, it makes it a bit too heavy. Should be in the same rythm as the rest.

[ReichiMD]

Yes, I agree with you and I'll take another look at it.👍