Filler & metadata-sync matching by episode number breaks for providers with non-canonical numbering (regional editions)

Describe your suggested feature

FillerEpisodeCheck.getFillerEpisodes() returns canonical (animefillerlist) episode numbers, and ResultViewModel2 flags fillers with fillers.contains(i.episode ?: index + 1). The same number-keyed matching drives Kitsu/AniList episode metadata (this.name = this.name ?: node.titles?.canonical, keyed by this.episode).

This breaks for providers that legitimately expose a regional edition whose numbering diverges from the canonical MAL/AniList one. Concrete case: the Italian edition of Detective Conan (AnimeUnity) is renumbered, and occasionally one Japanese episode is split into two (IT ep 53 + 54 = JP ep 52). Result: fillers marked on the wrong episodes, synced titles/thumbnails on the wrong episodes.

Other details

No response

Acknowledgements

• My suggestion is NOT about adding a new provider
• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.

Start by tracing FillerEpisodeCheck.getFillerEpisodes() into ResultViewModel2, then inspect the Kitsu/AniList metadata matching keyed by episode. The issue does not name files or tests; done would require a defined mapping that keeps fillers, titles, and thumbnails aligned for regional and split episode numbering.