Add interactive release search (M6)

Release listing and grab in the shared arr client, a full-screen release
list (sort, hide rejected, rejection reasons, confirmation before grabbing
rejected releases; Usenet only), and a season/episode picker for Sonarr.
Overlays are now a stack so dialogs can open above the release list.
Add a fake Newznab indexer to the dev setup.

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

internal/ui/search.go

@@ -95,6 +95,9 @@ func newSearchView(app *App, be backend, cfg config.Arr) *searchView {
 		case 'a':
 			v.add(v.list.GetCurrentItem())
 			return nil
+		case 'i':
+			v.interactive(v.list.GetCurrentItem())
+			return nil
 		}
 		return ev
 	})
@@ -239,6 +242,19 @@ func (v *searchView) showDetails(i int) {
 	v.details.SetText(v.results[i].details()).ScrollToBeginning()
 }
 
+// interactive opens the release list for the result at index i.
+func (v *searchView) interactive(i int) {
+	if i < 0 || i >= len(v.results) {
+		return
+	}
+	r := v.results[i]
+	if !r.inLibrary() {
+		v.app.SetMessage(fmt.Sprintf("[yellow]Add %s to %s first (a), then search for releases", tview.Escape(r.title()), v.be.name()))
+		return
+	}
+	v.be.interactive(v, r)
+}
+
 // add opens the add dialog for the result at index i.
 func (v *searchView) add(i int) {
 	if i < 0 || i >= len(v.results) {