feat: restore original YouTube titles with character transitions

tests/unit/app.rs

@@ -67,6 +67,77 @@ fn app(args: &[&str]) -> App {
     )
 }
 
+#[test]
+fn title_viewport_tracks_selected_two_line_rows_and_resize_without_changing_identity() {
+    let mut app = app(&["tubular"]);
+    let template =
+        youtube::search_results(r#"{"entries":[{"id":"jNQXAC9IVRw","title":"Listing title"}]}"#)
+            .unwrap()
+            .videos
+            .remove(0);
+    app.views[0].videos = (0..12)
+        .map(|index| {
+            let mut video = template.clone();
+            // Non-YouTube IDs keep this rendering check entirely offline.
+            video.id = format!("offline:{index}");
+            video.title = format!("Row {index:02}");
+            video
+        })
+        .collect();
+    app.views[0].selection.select(Some(9));
+    let now = Instant::now();
+    let mut terminal = ratatui::Terminal::new(ratatui::backend::TestBackend::new(80, 24)).unwrap();
+    terminal
+        .draw(|frame| app.draw_at(frame, Duration::ZERO, now))
+        .unwrap();
+    assert_eq!(app.views[0].selection.offset(), 3);
+    assert_eq!(
+        app.views[0].videos[app.views[0].selection.selected().unwrap()].id,
+        "offline:9"
+    );
+    assert!(!app.titles.active());
+
+    terminal.backend_mut().resize(80, 17);
+    terminal
+        .draw(|frame| {
+            app.draw_at(
+                frame,
+                Duration::from_millis(20),
+                now + Duration::from_millis(20),
+            )
+        })
+        .unwrap();
+    assert_eq!(app.views[0].selection.offset(), 7);
+    assert_eq!(
+        app.views[0].videos[app.views[0].selection.selected().unwrap()].id,
+        "offline:9"
+    );
+    let rendered: String = terminal
+        .backend()
+        .buffer()
+        .content
+        .iter()
+        .map(|cell| cell.symbol())
+        .collect();
+    assert!(rendered.contains("Row 09"));
+
+    app.views[0].selection.select(Some(0));
+    terminal
+        .draw(|frame| {
+            app.draw_at(
+                frame,
+                Duration::from_millis(40),
+                now + Duration::from_millis(40),
+            )
+        })
+        .unwrap();
+    assert_eq!(app.views[0].selection.offset(), 0);
+    assert_eq!(
+        app.views[0].videos[app.views[0].selection.selected().unwrap()].id,
+        "offline:0"
+    );
+}
+
 #[test]
 fn youtube_collections_isolate_mixed_provider_rows_and_removal_ids() {
     let mut app = app(&["tubular"]);