fix(radarr): model the download status as a DownloadStatus enum

Radarr was the only tree still holding DownloadRecord.status as a bare
String and comparing it against literals. It now carries its own
DownloadStatus enum, shaped exactly like the Sonarr, Lidarr and Readarr
copies, and is guarded with from_json_or_default so an unrecognised
status degrades to Unknown instead of failing the whole queue fetch.

The row-style decorator and get_movie_status compare against the enum
variants. The status cell is never rendered in the Radarr tree, so no
snapshot changes; the CLI JSON output is unchanged for every real value
since the enum serializes to the same camelCase strings.

src/handlers/radarr_handlers/radarr_handler_test_utils.rs

@@ -4,8 +4,8 @@ pub(in crate::handlers::radarr_handlers) mod utils {
   use crate::models::HorizontallyScrollableText;
   use crate::models::radarr_models::{
     AddMovieBody, AddMovieOptions, AddMovieSearchResult, Collection, CollectionMovie,
-    DownloadRecord, IndexerSettings, MediaInfo, MinimumAvailability, Movie, MovieCollection,
-    MovieFile, MovieMonitor, RadarrRelease, Rating, RatingsList,
+    DownloadRecord, DownloadStatus, IndexerSettings, MediaInfo, MinimumAvailability, Movie,
+    MovieCollection, MovieFile, MovieMonitor, RadarrRelease, Rating, RatingsList,
   };
   use crate::models::servarr_models::{
     Indexer, IndexerField, Language, Quality, QualityWrapper, RootFolder,
@@ -407,7 +407,7 @@ pub(in crate::handlers::radarr_handlers) mod utils {
   pub fn download_record() -> DownloadRecord {
     DownloadRecord {
       title: "Test Download Title".to_owned(),
-      status: "downloading".to_owned(),
+      status: DownloadStatus::Downloading,
       id: 1,
       movie_id: 1,
       size: 3543348019,