Add Sonarr client and series search/add flow (M3)

Sonarr client with lookup, add series (monitor modes) and search.
Refactor the movie view into a generic search view driven by a backend
interface so Movies and Series share one implementation.
Add F1-F4 / Alt+1-4 view switching that works while typing.

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

internal/ui/format.go

@@ -2,12 +2,14 @@ package ui
 
 import (
 	"fmt"
+	"strconv"
 	"strings"
 
 	"github.com/rivo/tview"
 
 	"git.stinnesbeck.com/nils/arr-tui/internal/arr"
 	"git.stinnesbeck.com/nils/arr-tui/internal/radarr"
+	"git.stinnesbeck.com/nils/arr-tui/internal/sonarr"
 )
 
 // movieLabel is the one-line list entry for a movie.
@@ -81,3 +83,69 @@ func folderIndex(folders []arr.RootFolder, path string) int {
 	}
 	return 0
 }
+
+func itoa(n int) string { return strconv.Itoa(n) }
+
+// seriesLabel is the one-line list entry for a series.
+func seriesLabel(s sonarr.Series) string {
+	label := tview.Escape(s.Title)
+	if s.Year > 0 {
+		label += fmt.Sprintf(" (%d)", s.Year)
+	}
+	if s.InLibrary() {
+		label += " [green]✓[-]"
+	}
+	return label
+}
+
+// seriesDetails renders the detail pane text for a series.
+func seriesDetails(s sonarr.Series) string {
+	var b strings.Builder
+	title := tview.Escape(s.Title)
+	if s.Year > 0 {
+		title += fmt.Sprintf(" (%d)", s.Year)
+	}
+	fmt.Fprintf(&b, "[::b]%s[::-]\n", title)
+
+	var facts []string
+	if s.Ratings.Value > 0 {
+		facts = append(facts, fmt.Sprintf("★ %.1f", s.Ratings.Value))
+	}
+	if n := s.SeasonCount(); n > 0 {
+		facts = append(facts, fmt.Sprintf("%d season%s", n, plural(n)))
+	}
+	if s.Runtime > 0 {
+		facts = append(facts, fmt.Sprintf("%d min", s.Runtime))
+	}
+	if len(s.Genres) > 0 {
+		facts = append(facts, tview.Escape(strings.Join(s.Genres, ", ")))
+	}
+	if len(facts) > 0 {
+		b.WriteString(strings.Join(facts, " · ") + "\n")
+	}
+	if s.Network != "" {
+		fmt.Fprintf(&b, "Network: %s\n", tview.Escape(s.Network))
+	}
+	if s.Status != "" {
+		fmt.Fprintf(&b, "Status: %s\n", tview.Escape(s.Status))
+	}
+	if s.InLibrary() {
+		st := s.Statistics
+		if st.EpisodeCount > 0 && st.EpisodeFileCount >= st.EpisodeCount {
+			b.WriteString("[green]In library, all episodes downloaded[-]\n")
+		} else {
+			fmt.Fprintf(&b, "[yellow]In library, %d/%d episodes downloaded[-]\n", st.EpisodeFileCount, st.EpisodeCount)
+		}
+	}
+	if s.Overview != "" {
+		b.WriteString("\n" + tview.Escape(s.Overview) + "\n")
+	}
+	return b.String()
+}
+
+func plural(n int) string {
+	if n == 1 {
+		return ""
+	}
+	return "s"
+}