feat: add results count chip to film poster

[Nacchofer31]

Summary

Add a results count chip to the film poster that displays the total number
of films in the current search pool.

Changes

• Design: Added a green pill chip (film icon + count) as an overlay in
  the top-right corner of the poster, symmetric to the existing info button.
• State: numberOfResults field already existed in RandomFilmState;
  now threaded from ViewModel → Screen → FilmDisplay → FilmPoster.
• ViewModel: numberOfResults is set to cachedResultFilms.size on
  success and reset to 0 on error or new search.
• UI: Chip only renders when numberOfResults > 0, using
  GreenAccent background with BackgroundDarkColor text/icon.

Files changed

• FilmPoster.kt — chip overlay at Alignment.TopEnd
• FilmDisplay.kt — forward numberOfResults param
• RandomFilmScreen.kt — extract and pass numberOfResults from state
• RandomFilmViewModel.kt — populate numberOfResults on fetch results
• RandomFilmState.kt — add numberOfResults field
• randomboxd.pen — design mockup updated

[codecov]

Codecov Report

❌ Patch coverage is 91.17647% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...m_film/presentation/components/ResultsCountChip.kt	91.30%	0 Missing and 2 partials ⚠️
...mboxd/random_film/presentation/RandomFilmScreen.kt	75.00%	0 Missing and 1 partial ⚠️
...random_film/presentation/components/FilmDisplay.kt	50.00%	0 Missing and 1 partial ⚠️
.../random_film/presentation/components/FilmPoster.kt	96.87%	0 Missing and 1 partial ⚠️
...film/presentation/viewmodel/RandomFilmViewModel.kt	83.33%	1 Missing ⚠️

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