Discover movies & tv shows by genre (#1610)

## Description
Adds genre rows for movies & TV shows to the discover page. These work
the same as on the Seerr web UI, clicking one will show media in the
genre.

### Related issues
Related to https://github.com/damontecres/Wholphin/issues/702

### Testing
Just on the emulator so far

## Screenshots
<img width="1280" height="720" alt="discover_genres Large"
src="https://github.com/user-attachments/assets/93e5ef25-e253-49bc-9009-89f814889c98"
/>


## AI or LLM usage
None

app/src/main/java/com/github/damontecres/wholphin/data/model/DiscoverItem.kt

@@ -92,13 +92,7 @@ data class DiscoverItem(
 
     val destination: Destination
         get() {
-            val jfType =
-                when (type) {
-                    SeerrItemType.MOVIE -> BaseItemKind.MOVIE
-                    SeerrItemType.TV -> BaseItemKind.SERIES
-                    SeerrItemType.PERSON -> BaseItemKind.PERSON
-                    SeerrItemType.UNKNOWN -> null
-                }
+            val jfType = type.baseItemKind
             return if (jellyfinItemId != null && jfType != null) {
                 Destination.MediaItem(
                     itemId = jellyfinItemId,