Series drill-down: poster and details of the selected season or episode

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019reK4DUGYqDUjniWYJvwUW

internal/ui/calendar_test.go

@@ -124,3 +124,48 @@ func TestSortEntriesAndDayLabel(t *testing.T) {
 		}
 	}
 }
+
+func TestSeriesRowDetail(t *testing.T) {
+	s := sonarr.Series{Title: "Andor", Year: 2022, Network: "Disney+", Status: "ended", Overview: "Series plot"}
+
+	// A season: the summary and the series plot.
+	d := seriesRowDetail(s, nil, 2, seasonSummary{number: 2, total: 12, have: 5}, true, "2026-01-01")
+	for _, want := range []string{"Andor", "(2022)", "Disney+", "Season 2", "5 of 12 episodes", "Monitored: yes"} {
+		if !strings.Contains(d.head, want) {
+			t.Errorf("season head missing %q:\n%s", want, d.head)
+		}
+	}
+	if d.plot != "Series plot" {
+		t.Errorf("season plot = %q", d.plot)
+	}
+
+	// An episode: its own title, air date, status and plot.
+	ep := &sonarr.Episode{SeasonNumber: 2, EpisodeNumber: 5, Title: "Welcome [Home]", AirDate: "2025-05-01", HasFile: true, Monitored: true, Overview: "Episode plot"}
+	d = seriesRowDetail(s, ep, 2, seasonSummary{}, true, "2026-01-01")
+	for _, want := range []string{"S02E05 Welcome [Home[]", "Aired: 2025-05-01", "downloaded"} {
+		if !strings.Contains(d.head, want) {
+			t.Errorf("episode head missing %q:\n%s", want, d.head)
+		}
+	}
+	if d.plot != "Episode plot" {
+		t.Errorf("episode plot = %q", d.plot)
+	}
+	// Without an episode plot the series plot stays.
+	ep.Overview = ""
+	if d := seriesRowDetail(s, ep, 2, seasonSummary{}, true, "2026-01-01"); d.plot != "Series plot" {
+		t.Errorf("fallback plot = %q", d.plot)
+	}
+}
+
+func TestForgetPane(t *testing.T) {
+	a := newTestApp(t)
+	n := len(a.panes)
+	d := newDetailPane(a)
+	if len(a.panes) != n+1 {
+		t.Fatal("a new pane must be registered")
+	}
+	a.forgetPane(d)
+	if len(a.panes) != n {
+		t.Errorf("%d panes after forgetting, want %d", len(a.panes), n)
+	}
+}