Thread trailer URL from detail state into DetailUiModel

Adds trailerUrl to DetailUiState and DetailUiModel so the detail
screen's data source can pass the resolved trailer through, and
adds the missing HeroPageChanged branch to CatalogHomeStore's
no-op action list.

app/src/main/java/com/fluxa/app/ui/catalog/AndroidDetailDataSource.kt

@@ -52,6 +52,7 @@ class AndroidDetailDataSource(
                         posterUrl = detail.poster,
                         backgroundUrl = detail.background,
                         logoUrl = detail.logo,
+                        trailerUrl = state.trailerUrl,
                         releaseLabel = detail.releaseInfo.orEmpty(),
                         ratingLabel = detail.imdbRating.orEmpty(),
                         runtimeLabel = detail.runtime,

data/src/commonMain/kotlin/com/fluxa/app/ui/catalog/DetailUiState.kt

@@ -26,5 +26,6 @@ data class DetailUiState(
     val savedPlayback: Meta? = null,
     val similarItems: List<Meta> = emptyList(),
     val trailers: List<DetailTrailer> = emptyList(),
+    val trailerUrl: String? = null,
     val userAddons: List<AddonDescriptor> = emptyList()
 )

shared/src/commonMain/kotlin/com/fluxa/app/shared/feature/catalog/CatalogHomeStore.kt

@@ -21,6 +21,7 @@ class CatalogHomeStore(
             is CatalogAction.PlayRequested,
             is CatalogAction.ResumeRequested,
             is CatalogAction.ItemFocused,
+            is CatalogAction.HeroPageChanged,
             is CatalogAction.MarkWatchedRequested,
             is CatalogAction.DropRequested,
             is CatalogAction.AddToLibraryRequested -> Unit

shared/src/commonMain/kotlin/com/fluxa/app/shared/feature/detail/DetailContracts.kt

@@ -48,6 +48,7 @@ data class DetailUiModel(
     val posterUrl: String?,
     val backgroundUrl: String?,
     val logoUrl: String?,
+    val trailerUrl: String? = null,
     val releaseLabel: String,
     val ratingLabel: String,
     val runtimeLabel: String?,