Library: mark titles that are downloading

While the Library is visible it reads the Radarr and Sonarr queues (on
opening, every 10 s, and shortly after a grab) and matches them to the
titles by movieId / seriesId. Those titles get a blue dot instead of the
green or grey one, and their details say how far the download is.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/ui/library_test.go

@@ -345,3 +345,39 @@ func TestSeasonPoster(t *testing.T) {
 		t.Errorf("a season poster that cannot be loaded falls back to the series poster: %q", got)
 	}
 }
+
+func TestDownloadingTitlesAreMarked(t *testing.T) {
+	movies := queueByTitle([]arr.QueueItem{
+		{MovieID: 3, Size: 100, SizeLeft: 55, TimeLeft: "00:06:12"},
+		{MovieID: 0}, // not matched to a movie
+	}, false)
+	series := queueByTitle([]arr.QueueItem{{SeriesID: 7, Size: 10, SizeLeft: 10}, {SeriesID: 7}, {MovieID: 3}}, true)
+	if len(movies) != 1 || movies[3].count != 1 || movies[3].progress != 45 || movies[3].dlLine() != "[blue]Downloading[-] 45% · 00:06:12 left\n" {
+		t.Errorf("movies %+v", movies)
+	}
+	if len(series) != 1 || series[7].count != 2 || series[7].dlLine() != "[blue]Downloading[-] 2 episodes\n" {
+		t.Errorf("series %+v", series)
+	}
+
+	a := newTestApp(t)
+	v := newLibraryView(a, a.radarr, a.sonarr)
+	p := v.panes[kindMovies]
+	p.all, p.loaded = []libItem{
+		{id: 3, title: "Dune", label: "Dune (2021)", monitored: true, details: detailText{head: "Dune\n"}},
+		{id: 4, title: "Heat", label: "Heat (1995)", monitored: true},
+	}, true
+	v.downloading[kindMovies] = movies
+	v.render()
+	cell := func(row int) string { return p.table.GetCell(row, 0).Text }
+	if !strings.HasPrefix(cell(1), "[blue]●[-]") || !strings.HasPrefix(cell(2), "[green]●[-]") {
+		t.Errorf("marks: %q / %q", cell(1), cell(2))
+	}
+	p.table.Select(1, 0)
+	v.renderDetails()
+	if !strings.Contains(v.details.detail.head, "Downloading[-] 45%") {
+		t.Errorf("details %q", v.details.detail.head)
+	}
+	if libMark(false, true) != "[blue]○[-]" {
+		t.Error("an unmonitored title in the queue keeps the hollow mark")
+	}
+}