feat: honor pinned libraries in Emby client Views order (#24)

Sort /Users/.../Views so libraries the user pinned on the web appear
first for Infuse/Emby/Jellyfin clients. Unpinned libraries keep their
existing sort_order / remote-mount order.

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: truewhile <truewhile@users.noreply.github.com>

internal/service/emby_views_pinned_test.go

@@ -0,0 +1,66 @@
+package service
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/truewhile/MeBox/internal/model"
+)
+
+func TestViewsOrdersPinnedLibrariesFirst(t *testing.T) {
+	svc := newTestEmbyService(t)
+	first := model.Library{Name: "AAA", Path: "/media/a", Type: "movie", Enabled: true, SortOrder: 0}
+	second := model.Library{Name: "BBB", Path: "/media/b", Type: "movie", Enabled: true, SortOrder: 1}
+	third := model.Library{Name: "CCC", Path: "/media/c", Type: "movie", Enabled: true, SortOrder: 2}
+	for _, lib := range []*model.Library{&first, &second, &third} {
+		if err := svc.repo.Library.Create(t.Context(), lib); err != nil {
+			t.Fatalf("create library: %v", err)
+		}
+	}
+
+	user := &model.User{Username: "viewer", PasswordHash: "hash", Role: "user"}
+	pinned, err := json.Marshal([]string{third.ID, first.ID})
+	if err != nil {
+		t.Fatal(err)
+	}
+	user.PinnedLibraryIDs = string(pinned)
+	if err := svc.repo.User.Create(t.Context(), user); err != nil {
+		t.Fatalf("create user: %v", err)
+	}
+
+	views, err := svc.Views(t.Context(), user.ID)
+	if err != nil {
+		t.Fatalf("Views: %v", err)
+	}
+	items := views["Items"].([]map[string]any)
+	if len(items) != 3 {
+		t.Fatalf("expected 3 views, got %d", len(items))
+	}
+	got := []string{items[0]["Id"].(string), items[1]["Id"].(string), items[2]["Id"].(string)}
+	want := []string{third.ID, first.ID, second.ID}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Fatalf("Views order = %v, want %v", got, want)
+		}
+	}
+}
+
+func TestSortViewItemsByPinnedIDsKeepsUnpinnedOrder(t *testing.T) {
+	items := []map[string]any{
+		{"Id": "a", "Name": "A"},
+		{"Id": "b", "Name": "B"},
+		{"Id": "c", "Name": "C"},
+		{"Id": "d", "Name": "D"},
+	}
+	sorted := sortViewItemsByPinnedIDs(items, []string{"c", "a"})
+	got := make([]string, len(sorted))
+	for i, item := range sorted {
+		got[i] = item["Id"].(string)
+	}
+	want := []string{"c", "a", "b", "d"}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Fatalf("order = %v, want %v", got, want)
+		}
+	}
+}