App v0.2.27 and gateway 0.1.23

Skip Intro from Emby's own chapter markers, trickplay seek previews from
BIF files, a server-composed home hero ranked on Radarr/Sonarr dates and
review scores, and My Alerts as its own page behind the user picker.

Related titles now degrade at every step instead of returning empty, and
the "+" is back on Manage users so a second viewer can be added from the
launcher.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

server/internal/api/trickplay_test.go

@@ -0,0 +1,78 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/ponzischeme89/memby/server/internal/store"
+)
+
+// The television decodes this into GatewayTrickplay; the matching Kotlin test is
+// `decodes a seek preview layout` in GatewayPayloadTest. Rename a field on either side and
+// one of them fails before a TV ever sees it.
+func TestTrickplayManifestShape(t *testing.T) {
+	raw, err := json.Marshal(trickplayManifest{
+		Available: true, IntervalMs: 10_000, Count: 817, Width: 320, Height: 172,
+	})
+	if err != nil {
+		t.Fatalf("marshal: %v", err)
+	}
+	want := `{"available":true,"intervalMs":10000,"count":817,"width":320,"height":172}`
+	if string(raw) != want {
+		t.Fatalf("manifest = %s, want %s", raw, want)
+	}
+}
+
+func TestTrickplayManifestOmitsTheRestWhenUnavailable(t *testing.T) {
+	// A title with no thumbnails, an operator who has turned the feature off and a gateway
+	// with no Emby all mean the same thing to a television, so they must all look the same
+	// on the wire — and none of them may carry a count it would try to draw from.
+	raw, err := json.Marshal(trickplayManifest{})
+	if err != nil {
+		t.Fatalf("marshal: %v", err)
+	}
+	if string(raw) != `{"available":false}` {
+		t.Fatalf("manifest = %s", raw)
+	}
+}
+
+func TestTrickplayAnswersUnavailableRatherThanFailing(t *testing.T) {
+	// A gateway with no Emby configured still answers, with 200 and "no previews". The
+	// seek indicator is a complete answer without a thumbnail, and an error here would be
+	// one nobody could act on, logged once per press of Right.
+	s := &Server{}
+	req := httptest.NewRequest(http.MethodGet, "/v1/items/42/trickplay", nil)
+	req.SetPathValue("id", "42")
+	rec := httptest.NewRecorder()
+
+	s.handleTrickplay(rec, req, store.Session{EmbyUserID: "user-1"})
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status = %d, want 200", rec.Code)
+	}
+	var manifest trickplayManifest
+	if err := json.Unmarshal(rec.Body.Bytes(), &manifest); err != nil {
+		t.Fatalf("unmarshal: %v", err)
+	}
+	if manifest.Available {
+		t.Fatal("a gateway with no Emby offered seek previews")
+	}
+}
+
+func TestTrickplayFrameRejectsAnUnreadableIndex(t *testing.T) {
+	s := &Server{}
+	for _, frame := range []string{"", "-1", "twelve", "12.png.jpg"} {
+		req := httptest.NewRequest(http.MethodGet, "/v1/items/42/trickplay/"+frame, nil)
+		req.SetPathValue("id", "42")
+		req.SetPathValue("frame", frame)
+		rec := httptest.NewRecorder()
+
+		s.handleTrickplayFrame(rec, req, store.Session{EmbyUserID: "user-1"})
+
+		if rec.Code != http.StatusNotFound {
+			t.Fatalf("frame %q: status = %d, want 404", frame, rec.Code)
+		}
+	}
+}