feat(readarr): fetch Readarr authors and expose them on the CLI

Add ReadarrEvent::ListAuthors, mapping to GET /author, and wire it up as
`managarr readarr list authors`.

This is the first Readarr event that touches the library rather than
configuration, so it creates the library/authors module tree mirroring
Lidarr's library/artists layout.

list_authors mirrors Lidarr's list_artists, including the sort-prompt
route guard: a response landing while the user has the sort prompt open
must not clobber their in-progress sort selection. Both directions of
that guard are covered by tests.

src/network/readarr_network/library/authors/mod.rs

@@ -0,0 +1,36 @@
+use anyhow::Result;
+use log::info;
+
+use crate::models::Route;
+use crate::models::readarr_models::Author;
+use crate::models::servarr_data::readarr::readarr_data::ActiveReadarrBlock;
+use crate::network::readarr_network::ReadarrEvent;
+use crate::network::{Network, RequestMethod};
+
+#[cfg(test)]
+#[path = "readarr_authors_network_tests.rs"]
+mod readarr_authors_network_tests;
+
+impl Network<'_, '_> {
+  pub(in crate::network::readarr_network) async fn list_authors(&mut self) -> Result<Vec<Author>> {
+    info!("Fetching Readarr authors");
+    let event = ReadarrEvent::ListAuthors;
+
+    let request_props = self
+      .request_props_from(event, RequestMethod::Get, None::<()>, None, None)
+      .await;
+
+    self
+      .handle_request::<(), Vec<Author>>(request_props, |mut authors_vec, mut app| {
+        if !matches!(
+          app.get_current_route(),
+          Route::Readarr(ActiveReadarrBlock::AuthorsSortPrompt, _)
+        ) {
+          authors_vec.sort_by_key(|a| a.id);
+          app.data.readarr_data.authors.set_items(authors_vec);
+          app.data.readarr_data.authors.apply_sorting_toggle(false);
+        }
+      })
+      .await
+  }
+}

src/network/readarr_network/library/authors/readarr_authors_network_tests.rs

@@ -0,0 +1,157 @@
+#[cfg(test)]
+mod tests {
+  use crate::models::readarr_models::{Author, ReadarrSerdeable};
+  use crate::models::servarr_data::readarr::readarr_data::ActiveReadarrBlock;
+  use crate::network::network_tests::test_utils::{MockServarrApi, test_network};
+  use crate::network::readarr_network::ReadarrEvent;
+  use pretty_assertions::assert_eq;
+  use serde_json::json;
+
+  #[tokio::test]
+  async fn test_handle_list_authors_event() {
+    let authors_json = json!([
+      {
+        "id": 2,
+        "authorName": "Zeta Author",
+        "foreignAuthorId": "foreign-author-2",
+        "status": "continuing",
+        "overview": "An overview of Zeta Author",
+        "path": "/nfs/books/Zeta Author",
+        "rootFolderPath": "/nfs/books/",
+        "qualityProfileId": 1,
+        "metadataProfileId": 1,
+        "monitored": true,
+        "monitorNewItems": "all",
+        "genres": ["Fantasy"],
+        "tags": [1]
+      },
+      {
+        "id": 1,
+        "authorName": "Alpha Author",
+        "foreignAuthorId": "foreign-author-1",
+        "status": "continuing",
+        "overview": "An overview of Alpha Author",
+        "path": "/nfs/books/Alpha Author",
+        "rootFolderPath": "/nfs/books/",
+        "qualityProfileId": 1,
+        "metadataProfileId": 1,
+        "monitored": true,
+        "monitorNewItems": "all",
+        "genres": ["Fantasy"],
+        "tags": [1]
+      }
+    ]);
+    let response: Vec<Author> = serde_json::from_value(authors_json.clone()).unwrap();
+    let mut sorted_authors = response.clone();
+    sorted_authors.sort_by_key(|author| author.id);
+    let (mock, app, _server) = MockServarrApi::get()
+      .returns(authors_json)
+      .build_for(ReadarrEvent::ListAuthors)
+      .await;
+    {
+      let mut app = app.lock().await;
+      app.server_tabs.set_index(3);
+      app.push_navigation_stack(ActiveReadarrBlock::Authors.into());
+    }
+    let mut network = test_network(&app);
+
+    let result = network
+      .handle_readarr_event(ReadarrEvent::ListAuthors)
+      .await;
+
+    mock.assert_async().await;
+
+    let ReadarrSerdeable::Authors(authors) = result.unwrap() else {
+      panic!("Expected Authors")
+    };
+
+    assert_eq!(authors, response);
+    assert_eq!(
+      app.lock().await.data.readarr_data.authors.items,
+      sorted_authors
+    );
+  }
+
+  #[tokio::test]
+  async fn test_handle_list_authors_event_no_op_when_user_is_selecting_sort_options() {
+    let authors_json = json!([{
+      "id": 1,
+      "authorName": "Alpha Author",
+      "foreignAuthorId": "foreign-author-1",
+      "status": "continuing",
+      "path": "/nfs/books/Alpha Author",
+      "rootFolderPath": "/nfs/books/",
+      "qualityProfileId": 1,
+      "metadataProfileId": 1,
+      "monitored": true,
+      "monitorNewItems": "all",
+      "genres": [],
+      "tags": []
+    }]);
+    let (mock, app, _server) = MockServarrApi::get()
+      .returns(authors_json)
+      .build_for(ReadarrEvent::ListAuthors)
+      .await;
+    {
+      let mut app = app.lock().await;
+      app.server_tabs.set_index(3);
+      app.push_navigation_stack(ActiveReadarrBlock::AuthorsSortPrompt.into());
+    }
+    let mut network = test_network(&app);
+
+    let result = network
+      .handle_readarr_event(ReadarrEvent::ListAuthors)
+      .await;
+
+    mock.assert_async().await;
+
+    assert_ok!(result);
+    assert_is_empty!(app.lock().await.data.readarr_data.authors);
+  }
+
+  #[tokio::test]
+  async fn test_handle_list_authors_event_failure() {
+    let stale_authors: Vec<Author> = serde_json::from_value(json!([{
+      "id": 99,
+      "authorName": "Stale Author",
+      "foreignAuthorId": "foreign-author-99",
+      "status": "continuing",
+      "path": "/nfs/books/Stale Author",
+      "rootFolderPath": "/nfs/books/",
+      "qualityProfileId": 1,
+      "metadataProfileId": 1,
+      "monitored": true,
+      "monitorNewItems": "all",
+      "genres": [],
+      "tags": []
+    }]))
+    .unwrap();
+    let (mock, app, _server) = MockServarrApi::get()
+      .returns(json!({}))
+      .status(500)
+      .build_for(ReadarrEvent::ListAuthors)
+      .await;
+    {
+      let mut app = app.lock().await;
+      app.server_tabs.set_index(3);
+      app
+        .data
+        .readarr_data
+        .authors
+        .set_items(stale_authors.clone());
+    }
+    let mut network = test_network(&app);
+
+    let result = network
+      .handle_readarr_event(ReadarrEvent::ListAuthors)
+      .await;
+
+    mock.assert_async().await;
+
+    assert_err!(result);
+    assert_eq!(
+      app.lock().await.data.readarr_data.authors.items,
+      stale_authors
+    );
+  }
+}

src/network/readarr_network/library/mod.rs

@@ -0,0 +1 @@
+mod authors;

src/network/readarr_network/mod.rs

@@ -7,6 +7,7 @@ use crate::models::readarr_models::{AddReadarrRootFolderBody, ReadarrSerdeable,
 use crate::models::servarr_models::{MetadataProfile, QualityProfile, Tag};
 use crate::network::{Network, RequestMethod};
 
+mod library;
 mod root_folders;
 mod system;
 
@@ -33,12 +34,14 @@ pub enum ReadarrEvent {
   GetTasks,
   GetUpdates,
   HealthCheck,
+  ListAuthors,
   StartTask(ReadarrTaskName),
 }
 
 impl NetworkResource for ReadarrEvent {
   fn resource(&self) -> &'static str {
     match &self {
+      ReadarrEvent::ListAuthors => "/author",
       ReadarrEvent::GetQueuedEvents | ReadarrEvent::StartTask(_) => "/command",
       ReadarrEvent::GetHostConfig | ReadarrEvent::GetSecurityConfig => "/config/host",
       ReadarrEvent::GetDiskSpace => "/diskspace",
@@ -122,6 +125,7 @@ impl Network<'_, '_> {
         .get_readarr_healthcheck()
         .await
         .map(ReadarrSerdeable::from),
+      ReadarrEvent::ListAuthors => self.list_authors().await.map(ReadarrSerdeable::from),
       ReadarrEvent::StartTask(task_name) => self
         .start_readarr_task(task_name)
         .await

src/network/readarr_network/readarr_network_tests.rs

@@ -13,6 +13,7 @@ mod tests {
   use tokio::sync::Mutex;
 
   #[rstest]
+  #[case(ReadarrEvent::ListAuthors, "/author")]
   #[case(ReadarrEvent::GetQueuedEvents, "/command")]
   #[case(ReadarrEvent::StartTask(Default::default()), "/command")]
   #[case(ReadarrEvent::GetHostConfig, "/config/host")]