feat: Episode Details Cast & Crew dynamic TMDB image loading

[akitikkx]

This PR finishes the Episode Details screen enhancements by resolving the missing actor portraits. It securely queries the TMDB person/{person_id}/images endpoint, maps the nested image paths into the domain models (TraktCast and TraktCrew), and leverages Coil SubcomposeAsyncImage components to render beautiful avatars!

Key Changes

• TMDb Cast/Crew Images: Added dynamic image lookup using the TMDb API. Parses tmdbId natively out of the fundamental Trakt core JSON responses (network/models/trakt/NetworkTraktEpisodePeopleResponse.kt).
• Domain Expansion: Expanded TraktCast and TraktCrew structures to expose the tmdbId natively throughout the application without executing complex database migrations.
• UI/UX Stability: Embedded safe failure cases via SubcomposeAsyncImage block structures within EpisodeDetailScreen.kt, natively transitioning back to a Material Icon if an actor's TMDB portrait doesn't exist. Let's make it look pristine!

Testing Instructions

• Navigate into a Show detail screen.
• Select an episode airing (or recently aired).
• Scroll down to the "Guest Stars" and "Crew" rows to observe the dynamic images loading securely over the network.
• Test across edge cases where guest actors have empty portraits.