REDI-90: character detail screen (type-safe nav args + MVI)

Add a CharacterDetail MVI stack (State/Action/Event/ViewModel + CharacterDetailUi)
to the UI-agnostic :feature:characters:presentation. The detail ViewModel reads the
typed characterId from SavedStateHandle (populated by the type-safe CharacterDetailRoute),
so the module keeps zero navigation/Compose deps.

Add CharacterDetailScreen (Root/Screen, image header, attribute rows, loading/error)
and CharacterDetailRoute to :presentation-compose; refactor charactersGraph to drive
list->detail via NavController and expose About / Views entries as callbacks. Extract
shared CharacterStatus label/colour helpers; add an overflow menu to the list app bar.

Add material-icons-core to the compose bundle for the app-bar icons.

gradle/libs.versions.toml

@@ -81,6 +81,7 @@ androidx-compose-ui-tooling-preview = { module = "androidx.compose.ui:ui-tooling
 androidx-compose-ui-test-junit4 = { module = "androidx.compose.ui:ui-test-junit4" }
 androidx-compose-ui-test-manifest = { module = "androidx.compose.ui:ui-test-manifest" }
 androidx-compose-material3 = { module = "androidx.compose.material3:material3" }
+androidx-compose-material-icons-core = { module = "androidx.compose.material:material-icons-core" }
 androidx-compose-material-icons-extended = { module = "androidx.compose.material:material-icons-extended" }
 
 # --- Coroutines / serialization ---
@@ -133,6 +134,7 @@ compose = [
     "androidx-compose-foundation",
     "androidx-compose-ui-tooling-preview",
     "androidx-compose-material3",
+    "androidx-compose-material-icons-core",
 ]
 koin = ["koin-core", "koin-android"]
 ktor = [