implimented first itteration of drill down

src/main.rs

@@ -432,10 +432,50 @@ fn handle_key(app: &mut App, code: KeyCode) {
                         }
                     }
                 }
+                View::Library { title, items, selected, .. } => {
+                    if items.is_empty() { return; }
+                    let it = &items[*selected];
+
+                    let ty = it.item_type.as_deref().unwrap_or("");
+
+                    // Shows -> Seasons -> Episodes
+                    if ty == "Series" {
+                        let q = core::jellyfin::LibraryQuery::all()
+                            .with_parent(it.id.clone())
+                            .with_item_types("Season");
+                        open_children(app, format!("{} > {}", title, it.name), q);
+                        return;
+                    }
+                    if ty == "Season" {
+                        let q = core::jellyfin::LibraryQuery::all()
+                            .with_parent(it.id.clone())
+                            .with_item_types("Episode");
+                        open_children(app, format!("{} > {}", title, it.name), q);
+                        return;
+                    }
+
+                    // MusicArtist -> MusicAlbum -> Audio
+                    if ty == "MusicArtist" {
+                        let q = core::jellyfin::LibraryQuery::all()
+                            .with_parent(it.id.clone())
+                            .with_item_types("MusicAlbum");
+                        open_children(app, format!("{} > {}", title, it.name), q);
+                        return;
+                    }
+                    if ty == "MusicAlbum" {
+                        let q = core::jellyfin::LibraryQuery::all()
+                            .with_parent(it.id.clone())
+                            .with_item_types("Audio");
+                        open_children(app, format!("{} > {}", title, it.name), q);
+                        return;
+                    }
+
+                    // Otherwise: later we can make Enter “play”, “details”, etc.
+                    app.status = format!("No drilldown for type: {}", ty);
+                }
                 _ => {}
             }
         }
-
         KeyCode::Esc | KeyCode::Backspace => {
             if app.view_stack.len() > 1 {
                 app.view_stack.pop();
@@ -443,7 +483,6 @@ fn handle_key(app: &mut App, code: KeyCode) {
                 app.selected = 0;
             }
         }
-
         KeyCode::Up | KeyCode::Char('k') => {
             match app.view_stack.last_mut().unwrap() {
                 View::Categories => {
@@ -475,7 +514,6 @@ fn handle_key(app: &mut App, code: KeyCode) {
                 _ => {}
             }
         }
-
         KeyCode::Down | KeyCode::Char('j') => {
             match app.view_stack.last_mut().unwrap() {
                 View::Categories => {
@@ -510,7 +548,6 @@ fn handle_key(app: &mut App, code: KeyCode) {
                 _ => {}
             }
         }
-
         KeyCode::Char('/') => {
             let scope = match app.current_view() {
                 View::Categories => SearchScope::All,
@@ -527,12 +564,10 @@ fn handle_key(app: &mut App, code: KeyCode) {
                 input: String::new(),
             });
         }
-
         _ => {}
     }
 }
 
-
 fn load_next_library_page(app: &mut App) {
     // pull info + mark loading
     let (query, next_start, total, page_size) = match app.view_stack.last_mut() {
@@ -580,7 +615,6 @@ fn finish_loading(app: &mut App) {
     }
 }
 
-
 fn maybe_prefetch(app: &mut App) {
     const PREFETCH_ROWS: usize = 0;
 
@@ -615,7 +649,6 @@ fn ensure_loaded_to_end(app: &mut App) {
     }
 }
 
-
 fn ui(frame: &mut Frame, app: &App) {
     let area = frame.area();
     let panes = layout(area);
@@ -805,6 +838,40 @@ fn render_library(
     );
 }
 
+fn open_children(app: &mut App, title: String, query: core::jellyfin::LibraryQuery) {
+    let cfg = match &app.config {
+        Some(c) => c.clone(),
+        None => { app.status = "No config loaded".into(); return; }
+    };
+    let user_id = match cfg.user_id.as_deref() {
+        Some(u) => u,
+        None => { app.status = "Missing user_id in config (login again)".into(); return; }
+    };
+    let client = match core::jellyfin::JellyfinClient::from_config(&cfg) {
+        Ok(c) => c,
+        Err(e) => { app.status = e; return; }
+    };
+
+    app.status = format!("Fetching {}...", title);
+
+    match client.list_items(user_id, query.clone(), 0, PAGE_SIZE) {
+        Ok(page) => {
+            app.view_stack.push(View::Library {
+                title,
+                query,
+                items: page.items,
+                selected: 0,
+                start_index: 0,
+                total: page.total,
+                page_size: PAGE_SIZE,
+                loading: false,
+            });
+            app.status = "Loaded".into();
+        }
+        Err(e) => app.status = format!("Fetch failed: {e}"),
+    }
+}
+
 struct Panes {
     top: Rect,
     left_main: Rect,